Hello.
I've got a Win95 box going through my Linux box to get to the internet.
When I send email from the Win machine using an SMTP server that is
external to my network, I get a handful of the following errors in my log
file:
IP fw-out deny eth0 ICMP/3 x.x.x.x y.y.y.y L=108 S=0xC0 I=26547 F=0x0000 T=64
x.x.x.x = external IP address on my linux box (eth0).
y.y.y.y = SMTP server, external to my network
And I have the following outgoing firewall rules set up for ICMP (assuming
this is where it is):
ipfwadm -O -a accept -P icmp -W $EXTERNAL_INTERFACE \
-S $IPADDR 0 4 8 12 -D $ANYWHERE
ipfwadm -O -a accept -P icmp -W $EXTERNAL_INTERFACE \
-S $IPADDR 3 11 -D $DHCP_SERVERS
ipfwadm -O -a deny -P icmp -o -W $EXTERNAL_INTERFACE \
-S $ANYWHERE -D $ANYWHERE
The email does get sent though I cannot really be sure there is a
performance hit from this or not. If I remove the deny line above, there
are no errors.
I cobbled these firewall rules together so I have to admit that I don't yet
understand the ICMP configurations and therefore don't know if I need it.
Can someone explain what this is, and offer a suggested change to my
firewall rules to eliminate this error?
thanks.
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