src routing question

[Jandre Olivier <jandre@xxxxxxxxxxxxx>]

Howzit guys,
I have a question that has been boggling my mind:
i have 2 servers( firewalls)
1 server connected to main ISP and another to another ISP( only certain 
traffic 195.0.0.0/8)

Server 1 to main ISP:

lan:        eth0 192.168.1.0/24
outside: eth1 196.15.203.194/30  gw 196.15.203.193
DMZ:   eth3  196.16.202.209/28 (mailservers etc ) i have alot more 
subnets, but not necassary to use here
private: eth4  10.0.10.2/24

Server 2 to second ISP ( only certain ips route through that)
# network 195.0.0.0/8 must route through here

outside: eth1 10.0.1.35/24
private: eth0  10.0.10.1/24

I use `ip rule add fwmark` and `iptables -t mangle PREROUTING` to route 
packets marked for 195.0.0.0/8 through 10.0.10.1/32
I masquarade the packets leaving eth1 on server 2 to 195.0.0.0/8

I want my DMZ section to be able to route to that network as well via 
10.0.10.1
obviously when a packet from 195.0.0.0/8 send me a mail it comes in on 
server 1(via the internet) and should go back out server 1 ( with src 
routing enabled )

My question:
with src routing enabled if I mark packets use `iptables -t mangle 
PREROUTING -i eth3 -s 196.16.202.209/28 -p all -j MARK --set-mark 888`  
will packets coming from 195.0.0.0 then be routed through server 2 , it 
wont work then cause its not src routed?????

When i start a download or something from the mailserver in the dmz 
zone, it go out via server2 , but will packets coming which originate 
from 195.0.0.0/8 via internet be routed out through server 1 again with 
my src routing enabled


i tried to explain it quite clearly, hope its understandable

Hope u guys can help

Thanks

Jandre


-- 
Regards
 Jandre

		"Some people are alive only because
		 it is illegal to kill them."

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