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SubjectRe: sent an invalid ICMP type 11, code 0 error to a broadcast: 0.0.0.0 on lo?
On Wed, 6 Jul 2005, Michael Tokarev wrote:

> 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.
>

Are you sure `lo` is configured properly, i.e.

ifconfig lo 127.0.0.1 netmask 255.0.0.0
route add -net 127.0.0.0 netmask 255.0.0.0 dev lo

There should be no LAN routes going through lo.
It looks as though there are:
> kernel: 192.168.4.2 sent an invalid ICMP type 11, code 0 error
> to a broadcast: 0.0.0.0 on lo
|________ 192.168.4.2 pinged lo

Only the 127.0.0.0 network should be routed through the loop-back
device.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
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