On Mon, 10 Jun 2002 22:53:25 EDT Nachman Yaakov Ziskind wrote:

> ... I need some basic pointers here. Specifically, I flushed all the rules
> (iptables -F) and changed the policy of all the builtins to ACCEPT:

[snip]
 
> So, why I can I not ping out eth0?
> 
> # ping 10.1.2.248
> PING 10.1.2.248 (10.1.2.248): 56 data bytes
> 
> # tail syslog
> 
> Jun 10 22:50:03 yoreach kernel: Shorewall:rfc1918:DROP:IN=eth0 OUT=
> MAC=00:10:5a:e1:e3:8b:00:20:6f:05:f9:6d:08:00 SRC=10.1.2.248 DST=10.1.2.203
> LEN=44 TOS=0x00 PREC=0x00 TTL=60 ID=5663 PROTO=TCP SPT=23 DPT=1025 WINDOW=409
>6
> RES=0x00 ACK SYN URGP=0
> 
> So, what am I missing?

The above iptables log entry is not from the ping (it's TCP not
ICMP), but it *may* still hold the answer to your question.  The
rule that dropped the packet above is "Shorewall:rfc1918" which
probably means you have a "norfc1918" entry in the eth0 line of
your /etc/shorewall/interfaces file.  Your ping to 10.1.2.248
*might* be dropped by that rule as well.

Not being intimately familiar with iptables and the inner workings
of shorewall, I'm a bit confused why a rfc1918 chain would override
the default policy.  Did you run "shorewall restart" after making
your changes?

--Brad


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