Problem using fwmark -- how to mark packets from local host?

Problem using fwmark -- how to mark packets from local host?

[John H. Spicer]

I'm trying to use fwmark to mark packets so that they can be routed to a 
particular interface.

I'm doing this:

iptables -t mangle -A PREROUTING -d ! $inet -j MARK --set-mark 0x0a -p tcp --dpo
rt 25
ip route add default via $IPADDR2 table TSMTP
ip rule add pref 1 fwmark 0x0a table TSMTP

I'm also using NAT and masquarading.

The rules above work for packets received from other systems that are going 
through NAT, but it doesn't work for packets from the local system.  Those 
packets are still going out through the normal default route of the system.

Is there a way to mark packets originating on the local system?

Thanks,

John Spicer

RE: Problem using fwmark -- how to mark packets from local host?

[Daniel Chemko]

Use the OUTPUT chain instead of the PREROUTING chain for packets
originating from the local system.

> Is there a way to mark packets originating on the local system?

Re: Problem using fwmark -- how to mark packets from local host?

[John H. Spicer]

Daniel Chemko wrote:
> Use the OUTPUT chain instead of the PREROUTING chain for packets
> originating from the local system.
> 
> 
>>Is there a way to mark packets originating on the local system?
> 
> 
> 

Thanks.  I tried that, but it did not seem to have any effect.  The command I 
used was:

iptables -t mangle -A OUTPUT -j MARK --set-mark 0x0a -p tcp --dport 25

Now, when connecting from the localhost, I get:

telnet: connect to address 66.33.196.49: No route to host

I can still connect via the NAT'd systems okay.

Thanks for the assistance!

John.