misc/142774: Problem with outgoing connections on interface with
multiple aliases
Sergey Chernikov
s.bilberry at gmail.com
Wed Jan 13 08:40:03 UTC 2010
>Number: 142774
>Category: misc
>Synopsis: Problem with outgoing connections on interface with multiple aliases
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jan 13 08:40:02 UTC 2010
>Closed-Date:
>Last-Modified:
>Originator: Sergey Chernikov
>Release: 8.0-STABLE
>Organization:
>Environment:
FreeBSD appserv 8.0-STABLE FreeBSD 8.0-STABLE #1: Wed Dec 30 16:21:27 MSK 2009 sc at appserv:/usr/src/sys/amd64/compile/APPSERV amd64
>Description:
(a side note: unfortunately there is no "net" category available on http://www.freebsd.org/send-pr.html)
I have network setup with 3 aliases on one of the interfaces. When trying to establish an outgoing connection to a host on other network, it fails (wait for connection until a timeout expires). Corresponding ipfw counter (rule 100 or 200 below) for policy route grows during this attempt. All incoming connections to addresses 10.12.12.0/24 can be established.
ifconfig:
bce0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 536
options=1bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4>
ether 18:a9:05:3b:3a:38
inet 172.23.31.27 netmask 0xffffff00 broadcast 172.23.31.255
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active
bce1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=1bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4>
ether 18:a9:05:3b:3a:3a
inet 10.12.12.1 netmask 0xffffff00 broadcast 10.12.12.255
inet 10.12.12.4 netmask 0xffffffff broadcast 10.12.12.4
inet 10.12.12.6 netmask 0xffffffff broadcast 10.12.12.6
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
options=3<RXCSUM,TXCSUM>
inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3
inet6 ::1 prefixlen 128
inet 127.0.0.1 netmask 0xff000000
nd6 options=3<PERFORMNUD,ACCEPT_RTADV>
Relevant portion of ipfw:
00100 6725 430586 fwd 10.12.12.254 ip from 10.12.12.0/24 to 172.23.31.34
00200 16016 1037707 fwd 10.12.12.254 ip from 10.12.12.0/24 to 10.10.10.2
00300 42 8124 allow tcp from 10.12.12.6 to 172.23.31.27 dst-port 25
00400 40 2552 allow udp from 10.12.12.6 to 172.23.31.27 dst-port 53
00500 40 8122 allow tcp from 10.12.12.4 to 172.23.31.27 dst-port 25
00600 80 5192 allow udp from 10.12.12.4 to 172.23.31.27 dst-port 53
00700 56 8426 allow tcp from 10.12.12.1 to 172.23.31.27 dst-port 25
00800 8484 822360 allow udp from 10.12.12.1 to 172.23.31.27 dst-port 53
00900 0 0 nat 1 ip from 10.12.12.6 to 10.10.10.1
01000 0 0 nat 1 ip from 10.12.12.4 to 10.10.10.1
01100 3692 192157 nat 1 ip from 10.12.12.1 to 10.10.10.1
01200 6587 3008474 nat 1 ip from 10.10.10.1 to 172.23.31.27 in
01300 0 0 deny log ip from 10.12.12.6 to 172.23.31.0/24
01400 0 0 deny log ip from 10.12.12.4 to 172.23.31.0/24
01500 0 0 deny log ip from 10.12.12.1 to 172.23.31.0/24
netstat -rn:
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 10.12.12.254 UGS 6 15898 bce1
10.10.10.0/24 172.23.31.62 UGS 1 20994 bce0
10.12.12.0/24 link#2 U 23164 427546 bce1
10.12.12.1 link#2 UHS 0 4630 lo0
10.12.12.4 link#2 UHS 0 108 lo0 =>
10.12.12.6 link#2 UHS 0 56 lo0 =>
10.12.12.4/32 link#2 U 0 0 bce1
10.12.12.6/32 link#2 U 0 89 bce1
10.214.0.0/16 172.23.31.62 UGS 0 106841 bce0
127.0.0.1 link#3 UH 0 669 lo0
172.23.31.0/24 link#1 U 9 8946135 bce0
172.23.31.27 link#1 UHS 0 4517 lo0
>How-To-Repeat:
>Fix:
When I remove routes for 10.12.12.6 ("route delete 10.12.12.6") everything starts to work, including outgoing connections from 10.12.12.6 to 172.23.31.34.
>Release-Note:
>Audit-Trail:
>Unformatted:
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