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Subjectsent an invalid ICMP type 11, code 0 error to a broadcast: 0.0.0.0 on lo?
On our gateway machine, wich is running 2.6 kernel, I'm seeing quite
several messages like this:

kernel: 192.168.4.2 sent an invalid ICMP type 11, code 0 error to a broadcast: 0.0.0.0 on lo
last message repeated 3 times
kernel: 192.168.4.2 sent an invalid ICMP type 11, code 0 error to a broadcast: 0.0.0.0 on lo
last message repeated 3 times

kernel: 81.13.90.174 sent an invalid ICMP type 11, code 0 error to a broadcast: 0.0.0.0 on lo
gate last message repeated 10 times

kernel: 81.13.90.174 sent an invalid ICMP type 11, code 0 error to a broadcast: 0.0.0.0 on lo
last message repeated 9 times

All the IP addresses mentioned are local to this box. It's always
like this, type11 code0 to 0.0.0.0 on lo.

The box is a gateway, which have "external" interface, several "LAN"
ifaces, DMZ, dialin modem pool and accepts vtund connections. And
it has iptables-based firewall and NAT enabled. Here's a lis of
network-related modules:

ppp_deflate 4736 0
zlib_deflate 21528 1 ppp_deflate
zlib_inflate 16640 1 ppp_deflate
ppp_async 8576 0
crc_ccitt 1920 1 ppp_async
ppp_generic 19860 2 ppp_deflate,ppp_async
slhc 6144 1 ppp_generic
tun 8320 13
crc32 3968 1 tun
ipt_ECN 2944 163
iptable_mangle 2304 1
ipt_REJECT 4096 1
ipt_LOG 6272 3
ipt_state 1664 3
ipt_comment 1536 22
iptable_filter 2432 1
iptable_nat 19420 1
ipt_NOTRACK 1920 3
iptable_raw 1792 1
ip_tables 18304 10 ipt_ECN,iptable_mangle,ipt_REJECT,ipt_LOG,ipt_state,ipt_comment,iptable_filter,iptable_nat,ipt_NOTRACK,iptable_raw
md5 3840 1
ipv6 218688 12
ip_conntrack 37560 3 ipt_state,iptable_nat,ipt_NOTRACK
aes_i586 38656 1
airo 63520 0
3c509 11476 0

I've seen several posts about problems *like* this, but
they're all not from the same box (usually it's some problem
with *another* device on the network which is sending bogus
packets, or with hubs/switches or cables). In this case,
it looks like it is this same box who's generating those
bad packets.

So far, I wasn't able to relate this message with any particular
network activity. It happens "randomly".

What it can be?

Thanks.

/mjt
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