On Mon, Apr 08, 2002 at 05:28:41PM +0200, Bernd Geier wrote:

> 2.: This don't work: (WHY)
> ipchains -A ianus0 -i eth0 -d xxx.xxx.xxx.xxx --destination-port
> 1024:65535 -p udp -j ACCEPT
> ipchinas -A ianus0 -i eth1 -s xxx.xxx.xxx.xxx --source-port 1024:65535
> -p udp -j ACCEPT
> Apr  8 16:51:42 ianus kernel: Packet log: ianus0 DENY eth1 PROTO=17
> 212.185.247.117:65535 xxx.xxx.xxx.xxx:65535 L=232 S=0x00 I=30408
> F=0x00B9 T=118 (#81)
> Apr  8 16:51:43 ianus kernel: Packet log: ianus0 DENY eth0 PROTO=17
> XXX.xxx.xxx.xxx:65535 212.185.247.117:65535 L=24 S=0x00 I=4249 F=0x00B9
> T=128 (#80)

These are fragmented packets.  You have two options
- always let fragments through (insecure)
- use stateful firewalling (i.e. iptables)

But this is getting rapidly off-topic..


cheers,
Lennert
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