Re: Where are my packets? Was: Unusual routing setup

From: Joerg Pommnitz (pommnitz@yahoo.com)
Date: Fri Mar 22 2002 - 04:07:47 EST


--- Casey Carter <Casey@Carter.net> wrote:
> I'm guessing that your kernel is performing reverse path filtering --
> i.e., it "knows" that packets from that source address should be coming
> over the loopback interface, and not ppp0. I suggest that you "echo 0 >
>
> /proc/sys/net/ipv4/conf/ppp0/rp_filter" to disable reverse path, and
> "echo 1 > /proc/sys/net/ipv4/conf/ppp0/log_martians" so you will get log
>
> messages for similar stuff.
>

Hi Casey,
close, but no cigar. To get off the (expensive) GPRS net I have reproduced
the setup on the LAN:
eth0 Link encap:Ethernet HWaddr 00:E0:4C:71:05:92
          inet addr:10.1.12.87 Bcast:10.1.12.255 Mask:255.255.255.0
eth1 Link encap:Ethernet HWaddr 00:E0:4C:71:05:91
          inet addr:10.1.12.151 Bcast:10.1.12.255 Mask:255.255.255.0

jpo> cat /proc/sys/net/ipv4/conf/eth0/rp_filter
0
jpo> cat /proc/sys/net/ipv4/conf/eth1/rp_filter
0
jpo> cat /proc/sys/net/ipv4/conf/eth1/log_martians
1
jpo> cat /proc/sys/net/ipv4/conf/eth0/log_martians
0

Running my program results in:
Mar 22 11:00:07 scorpio_1 kernel: martian source 10.1.12.151 from
10.1.12.87, on dev eth1
Mar 22 11:00:07 scorpio_1 kernel: ll header:
00:e0:4c:71:05:91:00:d0:03:6a:f7:fd:08:00
Mar 22 11:00:12 scorpio_1 kernel: NET: 4 messages suppressed.
Mar 22 11:00:12 scorpio_1 kernel: martian source 10.1.12.151 from
10.1.12.87, on dev eth1
Mar 22 11:00:12 scorpio_1 kernel: ll header:
00:e0:4c:71:05:91:00:d0:03:6a:f7:fd:08:00
Mar 22 11:00:17 scorpio_1 kernel: NET: 4 messages suppressed.
Mar 22 11:00:17 scorpio_1 kernel: martian source 10.1.12.151 from
10.1.12.87, on dev eth1
Mar 22 11:00:17 scorpio_1 kernel: ll header:
00:e0:4c:71:05:91:00:d0:03:6a:f7:fd:08:00
Mar 22 11:00:22 scorpio_1 kernel: NET: 4 messages suppressed.
Mar 22 11:00:22 scorpio_1 kernel: martian source 10.1.12.151 from
10.1.12.87, on dev eth1
Mar 22 11:00:22 scorpio_1 kernel: ll header:
00:e0:4c:71:05:91:00:d0:03:6a:f7:fd:08:00
Mar 22 11:00:27 scorpio_1 kernel: NET: 4 messages suppressed.
Mar 22 11:00:27 scorpio_1 kernel: martian source 10.1.12.151 from
10.1.12.87, on dev eth1
Mar 22 11:00:27 scorpio_1 kernel: ll header:
00:e0:4c:71:05:91:00:d0:03:6a:f7:fd:08:00

So, is there anything else I could try?

TIA
  Jörg

=====

-- 
Regards
       Joerg

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