sis(4) broken on 8.2 [Re: Carp seems completely broken on 8.2-RC2
and 8.2-PRERELEASE]
Paul Schenkeveld
freebsd at psconsult.nl
Mon Jan 17 19:56:23 UTC 2011
On Sun, Jan 16, 2011 at 01:41:22PM +0100, Paul Schenkeveld wrote:
> Hi,
>
> Trying to upgrade two Soekris firewalls to 8-STABLE or 8.2-PRERELEASE
> it appears that carp doesn't work at all. I've set up carp like I've
> done on many firewall pairs before and they all work correctly. With
> google, nor in the mailing lists, I could find anything about changes
> in the way carp get configured but if I missed something I'd be happy
> to hear that it's my fault.
>
> Here's the setup:
>
> net5501
> test3
> 10.4.0.4/24
> |
> -------------+-------------
> | |
> net4801 net4801
> test1 test2
> sis4: 10.4.0.2/24 sis4: 10.4.0.3/24
> carp4:10.4.0.1/24 carp4:10.4.0.1/24
> | | | | | | | |
> | | | | | | | |
> sis[0-3] connected to other networks, see
> explanation below.
>
> When I ping from test3 to 10.4.0.1, I see the following traffic using
> tcpdump:
>
> test3 # tcpdump -e -n -i vr3 not vrrp
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on vr3, link-type EN10MB (Ethernet), capture size 96 bytes
> 12:09:35.121831 00:00:24:c9:30:ff > ff:ff:ff:ff:ff:ff,
> ethertype ARP (0x0806), length 60:
> Request who-has 10.4.0.1 tell 10.4.0.4, length 46
> 12:09:35.122144 00:00:24:c3:49:91 > 00:00:24:c9:30:ff,
> ethertype ARP (0x0806), length 60:
> Reply 10.4.0.1 is-at 00:00:5e:00:01:68, length 46
> 12:09:35.122173 00:00:24:c9:30:ff > 00:00:5e:00:01:68,
> ethertype IPv4 (0x0800), length 98:
> 10.4.0.4 > 10.4.0.1: ICMP echo request,
> id 40482, seq 0, length 64
>
> test1 # tcpdump -e -n -i sis4 not vrrp
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on sis4, link-type EN10MB (Ethernet), capture size 96 bytes
> 12:09:34.977570 00:00:24:c9:30:ff > ff:ff:ff:ff:ff:ff,
> ethertype ARP (0x0806), length 60:
> Request who-has 10.4.0.1 tell 10.4.0.4, length 46
> 12:09:34.977705 00:00:24:c3:49:91 > 00:00:24:c9:30:ff,
> ethertype ARP (0x0806), length 42:
> Reply 10.4.0.1 is-at 00:00:5e:00:01:68, length 28
>
> test2 # dump -e -n -i sis4 not vrrp
> tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
> listening on sis4, link-type EN10MB (Ethernet), capture size 96 bytes
> 12:09:35.090050 00:00:24:c9:30:ff > ff:ff:ff:ff:ff:ff,
> ethertype ARP (0x0806), length 60:
> Request who-has 10.4.0.1 tell 10.4.0.4, length 46
>
> There is an ARP request which is replied to by the carp master (test).
> the ping to the carp address does not even appear on the sis4 interface
> of test1.
>
> This is the kernel config for test1 and test2:
>
> include GENERIC
> device carp
> makeoptions MODULES_OVERRIDE=""
>
> The relevant rc.conf bits:
>
> on test1
> hostname="test1"
> cloned_interfaces="carp1 carp2 carp3 carp4"
> ifconfig_sis0="xxx.xxx.xxx.41/26"
> ifconfig_sis1="10.1.0.2/24"
> ifconfig_sis2="10.2.0.2/24"
> ifconfig_sis3="10.3.0.2/24"
> ifconfig_sis4="10.4.0.2/24"
> ifconfig_carp1="10.1.0.1/24 vhid 101 pass abcd1234 advskew 0"
> ifconfig_carp2="10.2.0.1/24 vhid 102 pass abcd1234 advskew 0"
> ifconfig_carp3="10.3.0.1/24 vhid 103 pass abcd1234 advskew 0"
> ifconfig_carp4="10.4.0.1/24 vhid 104 pass abcd1234 advskew 0"
>
> on test2
> hostname="test2"
> cloned_interfaces="carp1 carp2 carp3 carp4"
> ifconfig_sis0="xxx.xxx.xxx.42/26"
> ifconfig_sis1="10.1.0.3/24"
> ifconfig_sis2="10.2.0.3/24"
> ifconfig_sis3="10.3.0.3/24"
> ifconfig_sis4="10.4.0.3/24"
> ifconfig_carp1="10.1.0.1/24 vhid 101 pass abcd1234 advskew 100"
> ifconfig_carp2="10.2.0.1/24 vhid 102 pass abcd1234 advskew 100"
> ifconfig_carp3="10.3.0.1/24 vhid 103 pass abcd1234 advskew 100"
> ifconfig_carp4="10.4.0.1/24 vhid 104 pass abcd1234 advskew 100"
>
> In /etc/sysctl.conf:
> net.inet.carp.preempt=1
>
> Ifconfig output:
>
> test1 # ifconfig sis4
> sis4: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=83808<VLAN_MTU,WOL_UCAST,WOL_MCAST,WOL_MAGIC,LINKSTATE>
> ether 00:00:24:c3:49:91
> inet 10.4.0.2 netmask 0xffffff00 broadcast 10.4.0.255
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> test1 # ifconfig carp4
> carp4: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
> inet 10.4.0.1 netmask 0xffffff00
> carp: MASTER vhid 104 advbase 1 advskew 0
>
> test2 # ifconfig sis4
> sis4: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500
> options=83808<VLAN_MTU,WOL_UCAST,WOL_MCAST,WOL_MAGIC,LINKSTATE>
> ether 00:00:24:c3:49:7d
> inet 10.4.0.3 netmask 0xffffff00 broadcast 10.4.0.255
> media: Ethernet autoselect (100baseTX <full-duplex>)
> status: active
> test2 # ifconfig carp4
> carp4: flags=49<UP,LOOPBACK,RUNNING> metric 0 mtu 1500
> inet 10.4.0.1 netmask 0xffffff00
> carp: BACKUP vhid 104 advbase 1 advskew 100
>
> There are no packet filters in place, sis1, sis2 and sis3 are wired
> through cross-cables from test1 to test2, so no traffic there except for
> carp. The sis4 interfaces and vr3 of test3 are on a dumb switch with no
> other stuff connected.
>
> Setting net.inet.carp.log=7 does not result in any console/dmesg/messages
> output.
>
> I see carp traffic on sis4 which appears normal except that I don't
> understand the addrs(7): part but that used to be there on 8.0/8.1
> firewalls too:
>
> 12:26:52.387140 00:00:5e:00:01:68 > 01:00:5e:00:00:12,
> ethertype IPv4 (0x0800), length 70:
> (tos 0x10, ttl 255, id 61070, offset 0, flags [DF],
> proto VRRP (112), length 56)
> 10.4.0.2 > 224.0.0.18: VRRPv2, Advertisement,
> vrid 104, prio 0, authtype none, intvl 1s, length 36,
> addrs(7): 198.145.25.33,1.75.182.226,80.169.106.108,
> 170.107.157.42,147.165.174.125,42.254.15.27,182.184.82.166
>
> 12:26:53.387903 00:00:5e:00:01:68 > 01:00:5e:00:00:12,
> ethertype IPv4 (0x0800), length 70:
> (tos 0x10, ttl 255, id 61479, offset 0, flags [DF],
> proto VRRP (112), length 56)
> 10.4.0.2 > 224.0.0.18: VRRPv2, Advertisement,
> vrid 104, prio 0, authtype none, intvl 1s, length 36,
> addrs(7): 101.233.35.135,163.243.214.16,230.125.241.59,
> 123.57.190.52,104.246.131.251,255.69.201.65,61.158.20.122
After taking apart two Soekris 4801 and replacing the lan1621 dual sis(4)
network card by an Intel PRO/100S (fxp) or a PRO/1000/MT (em) card, carp
works again on this interface.
Apparently the problem is not with carp(4) but with sis(4).
Since Soekris hardware (net45xx, net48xx, lan16xx) is quite popular for
firewalls and carp is quite often used together with this hardware, this
looks like a showstopper for 8.2 :-(
Regards,
Paul Schenkeveld
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