IPSec tcp session stalling
Volker
volker at vwsoft.com
Sat Oct 22 16:56:55 PDT 2005
Max & Co:
I've just seen I'm using kernel config 'options IPSEC' on both machines.
Should I try 'options FAST_IPSEC'? Would take some hours for kernel
recompile. Does the code IPSEC / FAST_IPSEC make a difference (even
while having not hardware crypto accelerator)?
May I use FAST_IPSEC even without any hw-crypto devices? While reading
`man fast_ipsec' I would think it depends on a hw-crypto device...
Please tell me if we should check IPSEC / FAST_IPSEC and I'll start a
recompile.
Volker
On 2005-10-23 00:40, Max Laier wrote:
> To try something else: Could you guys try to disable SACK on the machines
> involved? I haven't looked at the dumps as of yet, but that's one simple
> test that might help to identify the problem.
>
> sysctl net.inet.tcp.sack.enable=0
>
> On Sunday 23 October 2005 02:23, Volker wrote:
>
>>Michael,
>>
>>I not that sure if I'm right in checking what you suggested but when
>>trying to do ping hostB from hostA with oversized packets through the
>>IPSec tunnel by:
>>
>># ping -c 10 -s 12000 10.128.6.1
>>
>>I'm getting replies easily.
>>
>>While doing that and tcpdump'ing the gif interface, I'm seeing the
>>fragmented packets coming in properly.
>>
>>If that's a reliable check for MTU than the problem should not be MTU
>>related. Is there any other way to check MTU problems by using `ping'?
>>
>>Thanks,
>>
>>Volker
>>
>>On 2005-10-22 20:16, Michael VInce wrote:
>>
>>>Try sending different sized pings or other packet size control utils to
>>>really make sure its not MTU related.
>>>Maybe there is an upstream router thats blocking ICMP fragment packets,
>>>have you ever seen them? try forcing the creation of some.
>>>
>>>Mike
>>>
>>>Volker wrote:
>>>
>>>>Still having the same problem with an IPSec tunnel between FreeBSD 5.4R
>>>>hosts.
>>>>
>>>>Problem description:
>>>>scp session tries to transfer a large file through an IPSec tunnel. The
>>>>file is being transmitted but scp says 'stalled' after 56K (49152 bytes
>>>>file size). The IPSec tunnel itself is still up even after the scp
>>>>abort. Other tcp sessions break, too when sending too much traffic
>>>>through the tunnel.
>>>>
>>>>I've taken a closer look to it and tried to get something useful out of
>>>>the tcpdump but I'm unable to see any errors or I'm misinterpreting
>>>>something.
>>>>
>>>>The connection looks like:
>>>>
>>>>extIP: A.B.C.D
>>>>extIP: E.F.G.H
>>>>host A ------------------ (internet) ------------------ host B
>>>>tunnelIP: 10.128.1.6 tunnelIP:
>>>>10.128.6.1
>>>>
>>>>host A just has an external interface (em1) connected to a leased line
>>>>with a fixed IP address (IP-addr A.B.C.D).
>>>>host B has an S-DSL connection at xl0, PPPoE at ng0 (IP-addr. E.F.G.H).
>>>>
>>>>Both hosts are using gif for the IPSec tunnel.
>>>>
>>>>The routing tables (netstat -rnWf inet) are looking good and IMHO the
>>>>MTU is fine.
>>>>
>>>>host A:
>>>>em1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>>>> options=b<RXCSUM,TXCSUM,VLAN_MTU>
>>>> inet A.B.C.D netmask 0xfffffff8 broadcast A.B.C.z
>>>> ether 00:c0:9f:46:ec:c7
>>>> media: Ethernet autoselect (100baseTX <full-duplex>)
>>>> status: active
>>>>gif6: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
>>>> tunnel inet A.B.C.D --> E.F.G.H
>>>> inet 10.128.1.6 --> 10.128.6.1 netmask 0xffffffff
>>>> inet6 fe80::2c0:9fff:fe46:ecc6%gif6 prefixlen 64 scopeid 0x4
>>>>
>>>>Routing tables (shortened)
>>>>Destination Gateway Flags Refs Use Mtu
>>>>Netif Expire
>>>>default A.B.C.x UGS 2 516686 1500 em1
>>>>10.128.1.6 127.0.0.1 UH 0 14
>>>>16384 lo0
>>>>10.128.6.1 10.128.1.6 UH 0 6017
>>>>1280 gif6
>>>>127.0.0.1 127.0.0.1 UH 0 31633
>>>>16384 lo0
>>>>A.B.C.x/29 link#2 UC 0 0 1500 em1
>>>>A.B.C.D 00:c0:9f:46:ec:c7 UHLW 0 112 1500 lo0
>>>>
>>>>On host B the interfaces and routing tables are looking like:
>>>>xl0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
>>>> options=8<VLAN_MTU>
>>>> inet 0.0.0.0 netmask 0xff000000 broadcast 0.255.255.255
>>>> inet6 fe80::260:8ff:fe6c:e73c%xl0 prefixlen 64 scopeid 0x1
>>>> ether 00:60:08:6c:e7:3c
>>>> media: Ethernet 10baseT/UTP (10baseT/UTP <half-duplex>)
>>>> status: active
>>>>gif1: flags=8051<UP,POINTOPOINT,RUNNING,MULTICAST> mtu 1280
>>>> tunnel inet E.F.G.H --> A.B.C.D
>>>> inet6 fe80::260:8ff:fe6c:e73c%gif1 prefixlen 64 scopeid 0x4
>>>> inet 10.128.6.1 --> 10.128.1.6 netmask 0xffffffff
>>>>ng0: flags=88d1<UP,POINTOPOINT,RUNNING,NOARP,SIMPLEX,MULTICAST> mtu 1456
>>>> inet E.F.G.H --> 217.5.98.186 netmask 0xffffffff
>>>>
>>>>Routing tables (shortened)
>>>>Destination Gateway Flags Refs Use Mtu
>>>>Netif Expire
>>>>0 link#1 UC 0 0 1500
>>>>xl0 =>
>>>>default 217.5.98.186 UGS 1 38474
>>>>1456 ng0
>>>>10.128.1.6 10.128.6.1 UH 4 2196
>>>>1280 gif1
>>>>127.0.0.1 127.0.0.1 UH 0 80424
>>>>16384 lo0
>>>>217.5.98.186 E.F.G.H UH 1 0 1456 ng0
>>>>E.F.G.H lo0 UHS 0 0 16384 lo0
>>>>
>>>>While trying to fetch a file by scp on host A (receiver) from host B
>>>>(sender), I captured the following tcpdump on host B:
>>>>
>>>>tcpdump -netttvvi gif1:
>>>>
>>>>>000023 AF 2 1280: IP (tos 0x8, ttl 64, id 13202, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>43864:45092(1228) ack 1330 win 33156 <nop,nop,timestamp 481770567
>>>>>565002838>
>>>>>000207 AF 2 1280: IP (tos 0x8, ttl 64, id 52187, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>45092:46320(1228) ack 1330 win 33156 <nop,nop,timestamp 481770567
>>>>>565002838>
>>>>>000220 AF 2 1280: IP (tos 0x8, ttl 64, id 33774, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>46320:47548(1228) ack 1330 win 33156 <nop,nop,timestamp 481770568
>>>>>565002838>
>>>>>003524 AF 2 52: IP (tos 0x8, ttl 64, id 42063, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 38952 win 33156 <nop,nop,timestamp 565002844
>>>>>481770524> 000024 AF 2 1280: IP (tos 0x8, ttl 64, id 48541, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>47548:48776(1228) ack 1330 win 33156 <nop,nop,timestamp 481770571
>>>>>565002844>
>>>>>011203 AF 2 52: IP (tos 0x8, ttl 64, id 60517, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 41408 win 32542 <nop,nop,timestamp 565002855
>>>>>481770530> 000058 AF 2 1280: IP (tos 0x8, ttl 64, id 15798, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>48776:50004(1228) ack 1330 win 33156 <nop,nop,timestamp 481770582
>>>>>565002855>
>>>>>000246 AF 2 1280: IP (tos 0x8, ttl 64, id 31721, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>50004:51232(1228) ack 1330 win 33156 <nop,nop,timestamp 481770583
>>>>>565002855>
>>>>>005147 AF 2 52: IP (tos 0x8, ttl 64, id 22347, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 42636 win 33156 <nop,nop,timestamp 565002861
>>>>>481770542> 000024 AF 2 1280: IP (tos 0x8, ttl 64, id 61057, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>51232:52460(1228) ack 1330 win 33156 <nop,nop,timestamp 481770588
>>>>>565002861>
>>>>>020769 AF 2 52: IP (tos 0x8, ttl 64, id 27692, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 45092 win 32542 <nop,nop,timestamp 565002881
>>>>>481770547> 000027 AF 2 1280: IP (tos 0x8, ttl 64, id 64167, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>52460:53688(1228) ack 1330 win 33156 <nop,nop,timestamp 481770609
>>>>>565002881>
>>>>>000209 AF 2 1280: IP (tos 0x8, ttl 64, id 45457, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>53688:54916(1228) ack 1330 win 33156 <nop,nop,timestamp 481770609
>>>>>565002881>
>>>>>005260 AF 2 52: IP (tos 0x8, ttl 64, id 53832, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 46320 win 33156 <nop,nop,timestamp 565002887
>>>>>481770567> 000024 AF 2 1280: IP (tos 0x8, ttl 64, id 3515, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>54916:56144(1228) ack 1330 win 33156 <nop,nop,timestamp 481770614
>>>>>565002887>
>>>>>011020 AF 2 52: IP (tos 0x8, ttl 64, id 11608, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 48776 win 32542 <nop,nop,timestamp 565002898
>>>>>481770568> 000026 AF 2 1280: IP (tos 0x8, ttl 64, id 5848, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>56144:57372(1228) ack 1330 win 33156 <nop,nop,timestamp 481770625
>>>>>565002898>
>>>>>000211 AF 2 1280: IP (tos 0x8, ttl 64, id 39892, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>57372:58600(1228) ack 1330 win 33156 <nop,nop,timestamp 481770625
>>>>>565002898>
>>>>>005641 AF 2 52: IP (tos 0x8, ttl 64, id 7943, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 50004 win 33156 <nop,nop,timestamp 565002904
>>>>>481770582> 000024 AF 2 1280: IP (tos 0x8, ttl 64, id 8678, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>58600:59828(1228) ack 1330 win 33156 <nop,nop,timestamp 481770631
>>>>>565002904>
>>>>>011072 AF 2 52: IP (tos 0x8, ttl 64, id 38257, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 52460 win 32542 <nop,nop,timestamp 565002915
>>>>>481770583> 000025 AF 2 1280: IP (tos 0x8, ttl 64, id 12255, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>59828:61056(1228) ack 1330 win 33156 <nop,nop,timestamp 481770642
>>>>>565002915>
>>>>>000209 AF 2 1280: IP (tos 0x8, ttl 64, id 46257, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>61056:62284(1228) ack 1330 win 33156 <nop,nop,timestamp 481770642
>>>>>565002915>
>>>>>000222 AF 2 1280: IP (tos 0x8, ttl 64, id 4093, offset 0, flags
>>>>>[none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>62284:63512(1228) ack 1330 win 33156 <nop,nop,timestamp 481770643
>>>>>565002915>
>>>>>007065 AF 2 52: IP (tos 0x8, ttl 64, id 18720, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 53688 win 33156 <nop,nop,timestamp 565002922
>>>>>481770609> 000025 AF 2 1280: IP (tos 0x8, ttl 64, id 38378, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>63512:64740(1228) ack 1330 win 33156 <nop,nop,timestamp 481770650
>>>>>565002922>
>>>>>011034 AF 2 52: IP (tos 0x8, ttl 64, id 18718, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 56144 win 32542 <nop,nop,timestamp 565002934
>>>>>481770609> 000024 AF 2 1280: IP (tos 0x8, ttl 64, id 8148, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.53160: .
>>>>>64740:65968(1228) ack 1330 win 33156 <nop,nop,timestamp 481770661
>>>>>565002934>
>>>>>005991 AF 2 52: IP (tos 0x8, ttl 64, id 62285, offset 0, flags
>>>>>[none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum ok]
>>>>>1330:1330(0) ack 57372 win 33156 <nop,nop,timestamp 565002939
>>>>>481770625> 010726 AF 2 52: IP (tos 0x8, ttl 64, id 1549, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum
>>>>>ok] 1330:1330(0) ack 59828 win 32542 <nop,nop,timestamp 565002950
>>>>>481770625> 005670 AF 2 52: IP (tos 0x8, ttl 64, id 61504, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum
>>>>>ok] 1330:1330(0) ack 61056 win 33156 <nop,nop,timestamp 565002956
>>>>>481770642> 011260 AF 2 52: IP (tos 0x8, ttl 64, id 32633, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum
>>>>>ok] 1330:1330(0) ack 63512 win 32542 <nop,nop,timestamp 565002967
>>>>>481770642> 005510 AF 2 52: IP (tos 0x8, ttl 64, id 54614, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum
>>>>>ok] 1330:1330(0) ack 64740 win 33156 <nop,nop,timestamp 565002973
>>>>>481770650> 104909 AF 2 52: IP (tos 0x8, ttl 64, id 50471, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.53160 > 10.128.6.1.22: . [tcp sum
>>>>>ok] 1330:1330(0) ack 65968 win 33156 <nop,nop,timestamp 565003078
>>>>>481770661>
>>>>
>>>>tcpdump -netttvvi ng0 host A.B.C.D:
>>>>
>>>>>000227 AF 2 1352: IP (tos 0x8, ttl 64, id 25895, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x10b)
>>>>>011042 AF 2 128: IP (tos 0x8, ttl 61, id 5786, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf0)
>>>>>000226 AF 2 1352: IP (tos 0x8, ttl 64, id 36701, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x10c)
>>>>>000216 AF 2 1352: IP (tos 0x8, ttl 64, id 8789, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x10d)
>>>>>004853 AF 2 128: IP (tos 0x8, ttl 61, id 17128, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf1)
>>>>>000227 AF 2 1352: IP (tos 0x8, ttl 64, id 34888, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x10e)
>>>>>018747 AF 2 128: IP (tos 0x8, ttl 61, id 14828, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf2)
>>>>>000248 AF 2 1352: IP (tos 0x8, ttl 64, id 34356, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x10f)
>>>>>000223 AF 2 1352: IP (tos 0x8, ttl 64, id 34151, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x110)
>>>>>005030 AF 2 128: IP (tos 0x8, ttl 61, id 45476, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf3)
>>>>>000228 AF 2 1352: IP (tos 0x8, ttl 64, id 39765, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x111)
>>>>>011247 AF 2 128: IP (tos 0x8, ttl 61, id 63692, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf4)
>>>>>000226 AF 2 1352: IP (tos 0x8, ttl 64, id 29240, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x112)
>>>>>000222 AF 2 1352: IP (tos 0x8, ttl 64, id 43306, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x113)
>>>>>005663 AF 2 128: IP (tos 0x8, ttl 61, id 32980, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf5)
>>>>>000228 AF 2 1352: IP (tos 0x8, ttl 64, id 56920, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x114)
>>>>>010190 AF 2 128: IP (tos 0x8, ttl 61, id 3206, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf6)
>>>>>000227 AF 2 1352: IP (tos 0x8, ttl 64, id 4655, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x115)
>>>>>000215 AF 2 1352: IP (tos 0x8, ttl 64, id 62740, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x116)
>>>>>000203 AF 2 1352: IP (tos 0x8, ttl 64, id 35642, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x117)
>>>>>006875 AF 2 128: IP (tos 0x8, ttl 61, id 37801, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf7)
>>>>>000234 AF 2 1352: IP (tos 0x8, ttl 64, id 41803, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x118)
>>>>>010651 AF 2 128: IP (tos 0x8, ttl 61, id 54256, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf8)
>>>>>000235 AF 2 1352: IP (tos 0x8, ttl 64, id 30732, offset 0, flags
>>>>>[none], length: 1352) E.F.G.H > A.B.C.D: ESP(spi=0x078b2968,seq=0x119)
>>>>>007913 AF 2 128: IP (tos 0x8, ttl 61, id 7647, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xf9)
>>>>>011166 AF 2 128: IP (tos 0x8, ttl 61, id 58037, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xfa)
>>>>>005483 AF 2 128: IP (tos 0x8, ttl 61, id 65275, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xfb)
>>>>>011250 AF 2 128: IP (tos 0x8, ttl 61, id 47289, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xfc)
>>>>>005505 AF 2 128: IP (tos 0x8, ttl 61, id 203, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xfd)
>>>>>104747 AF 2 128: IP (tos 0x8, ttl 61, id 45263, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xfe)
>>>>>8. 338674 AF 2 128: IP (tos 0x8, ttl 61, id 36351, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0xff)
>>>>>319992 AF 2 128: IP (tos 0x8, ttl 61, id 18085, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0x100)
>>>>>441837 AF 2 128: IP (tos 0x8, ttl 61, id 58323, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0x101)
>>>>>684077 AF 2 128: IP (tos 0x8, ttl 61, id 35487, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0x102)
>>>>>1. 167602 AF 2 128: IP (tos 0x8, ttl 61, id 34442, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0x103)
>>>>>2. 136032 AF 2 128: IP (tos 0x8, ttl 61, id 8345, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0x104)
>>>>>2. 984665 AF 2 128: IP (tos 0x8, ttl 61, id 35456, offset 0, flags
>>>>>[none], length: 128) A.B.C.D > E.F.G.H: ESP(spi=0x0858046f,seq=0x105)
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>From what I'm seeing host B just stops sending without any reason. At
>>>>
>>>>least I don't see any fragmented packets. The only thing I've seen is
>>>>some packets doesn't get ack'ed by the receiver.
>>>>
>>>>These packets never get ack'ed:
>>>>46320:47548(1228)
>>>>50004:51232(1228)
>>>>53688:54916(1228)
>>>>57372:58600(1228)
>>>>61056:62284(1228)
>>>>
>>>>On host A I dumped the following:
>>>>
>>>>tcpdump -netttvvi gif6
>>>>
>>>>
>>>>>1129985378.941282 AF 2 52: IP (tos 0x8, ttl 64, id 41637, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 45092 win 32542 <nop,nop,timestamp 574090240
>>>>>490857876>
>>>>>1129985378.952628 AF 2 1280: IP (tos 0x8, ttl 64, id 14004, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>45092:46320(1228) ack 1330 win 33156 <nop,nop,timestamp 490857901
>>>>>574090210>
>>>>>1129985378.952657 AF 2 52: IP (tos 0x8, ttl 64, id 23243, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 46320 win 33156 <nop,nop,timestamp 574090251
>>>>>490857901>
>>>>>1129985378.958250 AF 2 1280: IP (tos 0x8, ttl 64, id 4306, offset 0,
>>>>>flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>46320:47548(1228) ack 1330 win 33156 <nop,nop,timestamp 490857901
>>>>>574090210>
>>>>>1129985378.971118 AF 2 1280: IP (tos 0x8, ttl 64, id 33534, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>47548:48776(1228) ack 1330 win 33156 <nop,nop,timestamp 490857920
>>>>>574090229>
>>>>>1129985378.971137 AF 2 52: IP (tos 0x8, ttl 64, id 60095, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 48776 win 32542 <nop,nop,timestamp 574090270
>>>>>490857901>
>>>>>1129985378.982488 AF 2 1280: IP (tos 0x8, ttl 64, id 11459, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>48776:50004(1228) ack 1330 win 33156 <nop,nop,timestamp 490857931
>>>>>574090240>
>>>>>1129985378.982516 AF 2 52: IP (tos 0x8, ttl 64, id 33184, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 50004 win 33156 <nop,nop,timestamp 574090281
>>>>>490857931>
>>>>>1129985378.987989 AF 2 1280: IP (tos 0x8, ttl 64, id 54180, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>50004:51232(1228) ack 1330 win 33156 <nop,nop,timestamp 490857931
>>>>>574090240>
>>>>>1129985378.994231 AF 2 1280: IP (tos 0x8, ttl 64, id 24535, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>51232:52460(1228) ack 1330 win 33156 <nop,nop,timestamp 490857942
>>>>>574090251>
>>>>>1129985378.994250 AF 2 52: IP (tos 0x8, ttl 64, id 30647, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 52460 win 32542 <nop,nop,timestamp 574090293
>>>>>490857931>
>>>>>1129985379.012101 AF 2 1280: IP (tos 0x8, ttl 64, id 61397, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>52460:53688(1228) ack 1330 win 33156 <nop,nop,timestamp 490857960
>>>>>574090270>
>>>>>1129985379.012132 AF 2 52: IP (tos 0x8, ttl 64, id 60550, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 53688 win 33156 <nop,nop,timestamp 574090311
>>>>>490857960>
>>>>>1129985379.017754 AF 2 1280: IP (tos 0x8, ttl 64, id 28408, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>53688:54916(1228) ack 1330 win 33156 <nop,nop,timestamp 490857961
>>>>>574090270>
>>>>>1129985379.023720 AF 2 1280: IP (tos 0x8, ttl 64, id 27558, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>54916:56144(1228) ack 1330 win 33156 <nop,nop,timestamp 490857972
>>>>>574090281>
>>>>>1129985379.023741 AF 2 52: IP (tos 0x8, ttl 64, id 21502, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 56144 win 32542 <nop,nop,timestamp 574090322
>>>>>490857961>
>>>>>1129985379.035333 AF 2 1280: IP (tos 0x8, ttl 64, id 18885, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>56144:57372(1228) ack 1330 win 33156 <nop,nop,timestamp 490857984
>>>>>574090293>
>>>>>1129985379.035362 AF 2 52: IP (tos 0x8, ttl 64, id 59875, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 57372 win 33156 <nop,nop,timestamp 574090334
>>>>>490857984>
>>>>>1129985379.040830 AF 2 1280: IP (tos 0x8, ttl 64, id 37252, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>57372:58600(1228) ack 1330 win 33156 <nop,nop,timestamp 490857984
>>>>>574090293>
>>>>>1129985379.046576 AF 2 1280: IP (tos 0x8, ttl 64, id 18349, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>58600:59828(1228) ack 1330 win 33156 <nop,nop,timestamp 490857984
>>>>>574090293>
>>>>>1129985379.046595 AF 2 52: IP (tos 0x8, ttl 64, id 43697, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 59828 win 32542 <nop,nop,timestamp 574090345
>>>>>490857984>
>>>>>1129985379.064961 AF 2 1280: IP (tos 0x8, ttl 64, id 38300, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>59828:61056(1228) ack 1330 win 33156 <nop,nop,timestamp 490858013
>>>>>574090322>
>>>>>1129985379.064993 AF 2 52: IP (tos 0x8, ttl 64, id 47539, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 61056 win 33156 <nop,nop,timestamp 574090364
>>>>>490858013>
>>>>>1129985379.070688 AF 2 1280: IP (tos 0x8, ttl 64, id 30345, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>61056:62284(1228) ack 1330 win 33156 <nop,nop,timestamp 490858013
>>>>>574090322>
>>>>>1129985379.076184 AF 2 1280: IP (tos 0x8, ttl 64, id 37536, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>62284:63512(1228) ack 1330 win 33156 <nop,nop,timestamp 490858014
>>>>>574090322>
>>>>>1129985379.076202 AF 2 52: IP (tos 0x8, ttl 64, id 34201, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 63512 win 32542 <nop,nop,timestamp 574090375
>>>>>490858013>
>>>>>1129985379.081680 AF 2 1280: IP (tos 0x8, ttl 64, id 20637, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>63512:64740(1228) ack 1330 win 33156 <nop,nop,timestamp 490858025
>>>>>574090334>
>>>>>1129985379.081709 AF 2 52: IP (tos 0x8, ttl 64, id 59866, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 64740 win 33156 <nop,nop,timestamp 574090380
>>>>>490858025>
>>>>>1129985379.087678 AF 2 1280: IP (tos 0x8, ttl 64, id 35213, offset
>>>>>0, flags [none], length: 1280) 10.128.6.1.22 > 10.128.1.6.59762: .
>>>>>64740:65968(1228) ack 1330 win 33156 <nop,nop,timestamp 490858036
>>>>>574090345>
>>>>>1129985379.186906 AF 2 52: IP (tos 0x8, ttl 64, id 2465, offset 0,
>>>>>flags [none], length: 52) 10.128.1.6.59762 > 10.128.6.1.22: . [tcp
>>>>>sum ok] 1330:1330(0) ack 65968 win 33156 <nop,nop,timestamp 574090486
>>>>>490858036>
>>>>
>>>>tcpdump -netttvvi em1 host E.F.G.H
>>>>
>>>>
>>>>>1129985379.064825 00:13:c4:fa:6c:20 > 00:c0:9f:46:ec:c7, ethertype
>>>>>IPv4 (0x0800), length 1366: IP (tos 0x8, ttl 61, id 45003, offset 0,
>>>>>flags [none], length: 1352) E.F.G.H > A.B.C.D:
>>>>>ESP(spi=0x0e0dffaa,seq=0x3e)
>>>>>1129985379.065024 00:c0:9f:46:ec:c7 > 00:13:c4:fa:6c:20, ethertype
>>>>>IPv4 (0x0800), length 142: IP (tos 0x8, ttl 64, id 1195, offset 0,
>>>>>flags [none], length: 128) A.B.C.D > E.F.G.H:
>>>>>ESP(spi=0x029a41b4,seq=0x2f)
>>>>>1129985379.070572 00:13:c4:fa:6c:20 > 00:c0:9f:46:ec:c7, ethertype
>>>>>IPv4 (0x0800), length 1366: IP (tos 0x8, ttl 61, id 36820, offset 0,
>>>>>flags [none], length: 1352) E.F.G.H > A.B.C.D:
>>>>>ESP(spi=0x0e0dffaa,seq=0x3f)
>>>>>1129985379.076069 00:13:c4:fa:6c:20 > 00:c0:9f:46:ec:c7, ethertype
>>>>>IPv4 (0x0800), length 1366: IP (tos 0x8, ttl 61, id 44971, offset 0,
>>>>>flags [none], length: 1352) E.F.G.H > A.B.C.D:
>>>>>ESP(spi=0x0e0dffaa,seq=0x40)
>>>>>1129985379.076233 00:c0:9f:46:ec:c7 > 00:13:c4:fa:6c:20, ethertype
>>>>>IPv4 (0x0800), length 142: IP (tos 0x8, ttl 64, id 56964, offset 0,
>>>>>flags [none], length: 128) A.B.C.D > E.F.G.H:
>>>>>ESP(spi=0x029a41b4,seq=0x30)
>>>>>1129985379.081565 00:13:c4:fa:6c:20 > 00:c0:9f:46:ec:c7, ethertype
>>>>>IPv4 (0x0800), length 1366: IP (tos 0x8, ttl 61, id 24742, offset 0,
>>>>>flags [none], length: 1352) E.F.G.H > A.B.C.D:
>>>>>ESP(spi=0x0e0dffaa,seq=0x41)
>>>>>1129985379.081741 00:c0:9f:46:ec:c7 > 00:13:c4:fa:6c:20, ethertype
>>>>>IPv4 (0x0800), length 142: IP (tos 0x8, ttl 64, id 9390, offset 0,
>>>>>flags [none], length: 128) A.B.C.D > E.F.G.H:
>>>>>ESP(spi=0x029a41b4,seq=0x31)
>>>>>1129985379.087562 00:13:c4:fa:6c:20 > 00:c0:9f:46:ec:c7, ethertype
>>>>>IPv4 (0x0800), length 1366: IP (tos 0x8, ttl 61, id 48065, offset 0,
>>>>>flags [none], length: 1352) E.F.G.H > A.B.C.D:
>>>>>ESP(spi=0x0e0dffaa,seq=0x42)
>>>>>1129985379.186945 00:c0:9f:46:ec:c7 > 00:13:c4:fa:6c:20, ethertype
>>>>>IPv4 (0x0800), length 142: IP (tos 0x8, ttl 64, id 36315, offset 0,
>>>>>flags [none], length: 128) A.B.C.D > E.F.G.H:
>>>>>ESP(spi=0x029a41b4,seq=0x32)
>>>>
>>>>If I'm not misleaded, this also doesn't show any errors except the
>>>>missing ack's. host B just stops sending. If there's an ack missing,
>>>>doesn't have the sending host to just repeat the un-ack'ed packet?
>>>>
>>>>The IPSec tunnel does not die. Even shortly after the (scp) transfer
>>>>stalls the tunnel itself is still usable (for small amounts of data). To
>>>>make it more worse, when disabling pf at the senders side, the transfer
>>>>works. I've tripple checked pflog for denied packets on both sides but
>>>>pf didn't filter any packets out.
>>>>
>>>>When disabling the IPSec rules using `setkey -F; setkey -FP' on the
>>>>tunnel for a moment, the scp transfer does not stall. So it's not a gif
>>>>issue.
>>>>
>>>>It doesn't seem to be an MTU issue (pf has also the rule 'scrub in/out
>>>>all no-df'), but what kind of issue is that?? Has anybody ever
>>>>experienced similar things? Or am I misinterpreting the tcpdump output?
>>>>
>>>>
>>>>Any help and hint is appreciated! Without an error message I'm lost.
>>>>
>>>>Volker
>>>>
>>>>_______________________________________________
>>>>freebsd-net at freebsd.org mailing list
>>>>http://lists.freebsd.org/mailman/listinfo/freebsd-net
>>>>To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
>>
>>_______________________________________________
>>freebsd-net at freebsd.org mailing list
>>http://lists.freebsd.org/mailman/listinfo/freebsd-net
>>To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
>
>
More information about the freebsd-net
mailing list