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Old 12-17-2008, 05:56 PM
Moritz Muehlenhoff
 
Default Bug#397550: routing between alias subnets on same interface produces RFC-1812 contravening ICMP redirects

On Wed, Nov 08, 2006 at 01:05:28AM -0500, K Chase wrote:
> Package: linux-image
> Version: 2.6.18
>
> This really isnt debian's fault. I just want to see if I can get a bug
> that was talked about and a patch offered for linux 2.2 in 2000 (!!)
> and discussed several times since actually FIXED sometime somehow.
> At least debian can patch it in its kernels even if the rest of the
> world carries this around forever.
>
> All the details of how this bug works are described here (though Ive
> included all salient details in this report):
>
> http://oss.sgi.com/archives/netdev/2004-07/msg00512.html
>
> The offending line in linux-tree-2.6.18 is now at
> line 1750 of net/ipv4/route.c and can use the same patch as per
> the above url.
>
> As the url above indicates, reproduce this bug with:
>
> To trigger this, you need two linux boxes. On the box acting as
> router (it only needs one ethernet interface), do:
>
> ifconfig eth0 down
> ifconfig eth0 192.168.10.1 netmask 255.255.255.0
> ifconfig eth0:1 192.168.99.1 netmask 255.255.255.0
> echo 1 > /proc/sys/net/ipv4/ip_forward
> for f in /proc/sys/net/ipv4/conf/*/shared_media
> do
> echo 0 > $f
> done
>
> On the other box, start a sniffer such as ethereal, and do:
>
> ifconfig eth0 down
> ifconfig eth0 192.168.10.2 netmask 255.255.255.0
> route add -net 192.168.99.0/24 gw 192.168.10.1
> ping 192.168.99.2
>
> You will see ICMP redirect packets sent from 10.1 to 10.2 telling it
> to route to 99.2 directly itself. Obviously impossible for 10.2 since
> it's not on the 99.0/24 network.
>
> This is tested with 2.6.17-2-vserver-k7 and 2.4.22-ac2 (which I spose
> is not strictly debian), but the bug has been in the source since
> linux 2.2 as mentioned.

Does this error still occur with more recent kernel versions?

Cheers,
Moritz




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