* iptables NAT entry times out but connects from firewall
@ 2003-04-28 17:57 Hanasaki JiJi
2003-04-29 19:07 ` Harald Welte
0 siblings, 1 reply; 2+ messages in thread
From: Hanasaki JiJi @ 2003-04-28 17:57 UTC (permalink / raw)
To: Linux - LIST
There is a firewall with two NICs and the below rule to allow an
internal host to connect out to smtp servers on the internet. Some
hosts have a connection timeout on a connect from $INTERNAL_IP_OF_SMTP
yet connect from the firewall just fine.
iptables -t nat -A POSTROUTING -p tcp -o $NIC_EXTERNAL \
--dport 25 -s $INTERNAL_IP_OF_SMTP -j MASQUERADE
ex:
on firewall:
telnet csoc-mail-msfc.csoconline.com 25
above connects ok
on $INTERNAL_IP_OF_SMTP
telnet csoc-mail-msfc.csoconline.com 25
connection times out
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: iptables NAT entry times out but connects from firewall
2003-04-28 17:57 iptables NAT entry times out but connects from firewall Hanasaki JiJi
@ 2003-04-29 19:07 ` Harald Welte
0 siblings, 0 replies; 2+ messages in thread
From: Harald Welte @ 2003-04-29 19:07 UTC (permalink / raw)
To: Hanasaki JiJi; +Cc: Linux Kernel Mailinglist
[-- Attachment #1: Type: text/plain, Size: 913 bytes --]
On Mon, Apr 28, 2003 at 12:57:16PM -0500, Hanasaki JiJi wrote:
> There is a firewall with two NICs and the below rule to allow an
> internal host to connect out to smtp servers on the internet. Some
> hosts have a connection timeout on a connect from $INTERNAL_IP_OF_SMTP
> yet connect from the firewall just fine.
this seems to be an iptables usage problem, please follow-up to the
netfilter mailinglist at netfilter@lists.netfilter.org.
for more information, plaese see the netfilter homepage at
http://www.netfilter.org
--
- Harald Welte <laforge@netfilter.org> http://www.netfilter.org/
============================================================================
"Fragmentation is like classful addressing -- an interesting early
architectural error that shows how much experimentation was going
on while IP was being designed." -- Paul Vixie
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^ permalink raw reply [flat|nested] 2+ messages in thread
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