Is dropping all ICMP traffic valid?

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I'm still trying to figure out why I'm losing connection on my
portforwarded webserver. One thing I have noticed is the gateway is
dropping ICMP packets back to the webserver:

Nov 12 23:01:16 gateway kernel: [Dropped to-lan]IN= OUT=eth0
SRC=192.168.1.250 DST=192.168.1.110 LEN=576 TOS=0x00 PREC=0xC0 TTL=64
ID=13411 PROTO=ICMP TYPE=3 CODE=4 [SRC=192.168.1.110 DST=213.155.151.41
LEN=1500 TOS=0x00 PREC=0x00 TTL=63 ID=8806 DF PROTO=TCP SPT=80 DPT=4776
WINDOW=7504 RES=0x00 ACK URGP=0 ] MTU=1478 

which seem to be related to the web connection. I thought ICMP packets
were not needed for general operation, and even if they where they would
be covered by the nat and FORWARD tables not being dropped on the local
process OUTPUT chain.

Any ideas?

-- 
Alex
http://www.bennee.com/~alex/




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