I'm having a strange situation for quite sometime. I have two external
interfaces one of which is an ADSL interface tun0 and obtains IP address
dynamically and the other is a (xl1) leased line which has a static
global IP address, lets say 212.64.212.180. Both interfaces access
internet without any problem.
Recently I've configured qmail on this system to send out email thru xl1
interface and use ADSL only for web traffic. It used to work quite good
for a while but recently I noticed TCP packets have been going out from
tun0 and responses coming in thru xl1. tun0 and ADSL is the default
gateway. But the TCP packets are bound to 212.64.212.180 IP address
which should send them out thru xl1. But it doesn't.
For the test, I did these
tcpdump -nt -i xl1 tcp &
telnet -s 212.64.212.180 smtp.tnet.com 25
connection establishes but I can see only the TCP response packets
coming from xl1, like the following
x.y.z.t > 212.64.212.180
x.y.z.t > 212.64.212.180
All from external IPs to my xl1 int. No packets going out from xl1 they
all go thru default gateway even if TCP connections are bound to xl1's
IP address.
I'd like to know if anybody knows why this happened and I can I turn
things back the way they were. Any help would be much appreciated.
My configuration is like this;
FreeBSD 5.4-RELEASE
ipf: IP Filter: v3.4.35 (336)
Kernel: IP Filter: v3.4.35
ipfw has no rules; allow ip from any to any
there's also a transparent proxy setup for squid
#~>netstat -rn
Routing tables
Internet:
Destination Gateway Flags Refs Use Netif Expire
default 88.234.8.1 UGS 0 78722302 tun0
10/24 link#1 UC 0 0 rl0 =>
10 10.1.1.222 UGS 0 26233 xl0
10.0.0.99 link#1 UHLW 0 4 rl0
10.1.1/24 link#2 UC 0 0 xl0
10.1.1.13 00:50:8d:ed:88:94 UHLW 0 1876 xl0 1118
10.1.1.222 00:01:02:df:c1:19 UHLW 1 689 lo0
10.1.1.225 00:b0:d0:20:b7:9e UHLW 0 96690 xl0 706
88.234.8.1 88.234.14.26 UH 1 0 tun0
127.0.0.1 127.0.0.1 UH 0 2305904 lo0
192.168.0/16 link#3 UCS 0 0 xl1
212.64.212.176 ff:ff:ff:ff:ff:ff UHLWb 0 15 xl1 =>
212.64.212.176/29 link#3 UC 0 0 xl1
212.64.212.180 00:04:76:9b:3d:f8 UHLW 0 125 lo0
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