The Problem:
the command "telnet 212.172.23.17 80", done from a machine outside my
network generates syn requests on the device tun2 on my machine (a tunnel
device using vtun). tcpdump tun2:
00:04:55.066516 12.4.218.41.4624 > 212.172.23.17.80: S 219810852:219810852(0) win
16384 <mss 1460,nop,wscale 0,nop,nop,timestamp[|tcp]> (DF) [tos 0x10]
00:04:55.119757 129.13.162.254 > 212.172.23.17: icmp: host 12.4.218.41 unreachable -
admin prohibited filter
(the second packet is due to the misrouting of the return packet on the
interface tun1, which hits some firewall):
00:04:55.066779 212.172.23.17.80 > 12.4.218.41.4624: S 437426418:437426418(0) ack
219810853 win 15510 <mss 1410,nop,nop,timestamp 7186830[|tcp]> (DF)
00:04:58.100986 212.172.23.17.80 > 12.4.218.41.4624: S 437426418:437426418(0) ack
219810853 win 15510 <mss 1410,nop,nop,timestamp 7187134[|tcp]> (DF)
The problem is that everything works fine at first, but after some time
after starting the network tunnels (between 5 minutes and a few days!)
packets received on one interface get sound on another one, generally the
wrong one.
ifconfig down/up of the device usually works (it happens between tun1/tun2,
tun2/ippp0 and even ippp0 and eth1, for example).
Does anybody have an idea what's going wrong here, and how to fix
this? Thanks a lot in advance, I'd be happy to provide more info.
My config:
linux-2.2.17 with most advanced router functions enabled (I can send my
.config if neccessary).
doom:~# ip rule list
0: from all lookup local
32766: from all lookup main
32767: from all lookup default
doom:~# ip route list table local
local 10.0.0.5 dev eth0 proto kernel scope host src 10.0.0.5
local 10.0.0.5 dev eth1 proto kernel scope host src 10.0.0.5
broadcast 127.255.255.255 dev lo proto kernel scope link src 127.0.0.1
broadcast 193.0.0.0 dev ippp0 proto kernel scope link src 62.224.169.116
local 62.224.169.116 dev ippp0 proto kernel scope host src 62.224.169.116
broadcast 10.255.255.255 dev eth0 proto kernel scope link src 10.0.0.5
broadcast 10.255.255.255 dev eth1 proto kernel scope link src 10.0.0.5
broadcast 193.255.255.255 dev ippp0 proto kernel scope link src 62.224.169.116
broadcast 127.0.0.0 dev lo proto kernel scope link src 127.0.0.1
local 127.0.0.1 dev lo proto kernel scope host src 127.0.0.1
local 129.13.162.92 dev tun1 proto kernel scope host src 129.13.162.92
local 127.0.0.0/8 dev lo proto kernel scope host src 127.0.0.1
doom:~# ip route list table main
192.168.255.202 dev tun1 proto kernel scope link src 129.13.162.92
10.0.0.1 dev eth0 scope link
212.172.23.18 via 10.0.0.1 dev eth0
192.168.254.1 dev tun2 proto kernel scope link src 212.172.23.17
10.0.0.2 dev eth1 scope link
129.13.162.8 dev ippp0 scope link
10.0.0.9 dev eth1 scope link
129.13.162.93 via 10.0.0.1 dev eth0
172.16.0.0/12 dev tun1 scope link
193.0.0.0/8 dev ippp0 proto kernel scope link src 62.224.169.116
default dev ippp0 scope link
default via 193.158.133.205 dev ippp0
doom:~# ip route list table default
[empty]
doom:~# ip link list
1: lo: <LOOPBACK,UP> mtu 3924 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: ippp0: <POINTOPOINT,NOARP,UP> mtu 1500 qdisc pfifo_fast qlen 30
link/ppp
3: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:e0:7d:03:38:73 brd ff:ff:ff:ff:ff:ff
4: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:e0:7d:03:38:68 brd ff:ff:ff:ff:ff:ff
29: tun1: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1450 qdisc pfifo_fast qlen 10
link/ppp
30: tun2: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1450 qdisc pfifo_fast qlen 10
link/ppp
doom:~# ip address list
1: lo: <LOOPBACK,UP> mtu 3924 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: ippp0: <POINTOPOINT,NOARP,UP> mtu 1500 qdisc pfifo_fast qlen 30
link/ppp
inet 62.224.169.116 peer 193.158.133.205/8 scope global ippp0
3: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:e0:7d:03:38:73 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.5/32 brd 10.255.255.255 scope global eth0
4: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:e0:7d:03:38:68 brd ff:ff:ff:ff:ff:ff
inet 10.0.0.5/32 brd 10.255.255.255 scope global eth1
29: tun1: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1450 qdisc pfifo_fast qlen 10
link/ppp
inet 129.13.162.92 peer 192.168.255.202/32 scope global tun1
30: tun2: <POINTOPOINT,MULTICAST,NOARP,UP> mtu 1450 qdisc pfifo_fast qlen 10
link/ppp
inet 212.172.23.17 peer 192.168.254.1/32 scope global tun2
inet 212.172.23.21/32 scope global tun2
--
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----==-- _ |
---==---(_)__ __ ____ __ Marc Lehmann +--
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