[nmglug] iptables question,

[Andres Paglayan]

Hi,

I have this situation where I have to connect to a sql server that  
runs in a virtual machine,
the box is in the hospital to which I am connected through a T1

the physical ip  of the box is n.n.2.35 and named  
dserver.localdomain.ms-sql
the virtual server is n.n.2.34 and named dserver.localdomain.virtual

now, in my host files, I am only resolving
n.n.2.34 	dserver

from a tcpdump I saw that even if the requests are supposing to go to  
2.34
  I am getting responses back from 2.35 which are obviously not  
traversing the router/firewall
meaning the physical machine's ip is responding instead of the  
virtual machine,

the puzzle is that if I am at their physical network I can connect  
with no problems,
and from my network I can ping or reach any other of their computers.

I have routes and nat to there such as in

(for my internal traffic to that device in the router)
/sbin/route add -net 192.168.50.0/24 gw 192.168.50.1
/sbin/iptables -t nat -A POSTROUTING -d 192.168.50.0/24 -j SNAT --to  
192.168.50.1

(and also for traffic to that address)
/sbin/route add -net n.n.0.0/23 gw 192.168.50.1
/sbin/iptables -t nat -A POSTROUTING -d n.n.0.0/23 -j SNAT --to  
192.168.50.1

now, the question is,
which rule will make either responses from 2.35 or from 2.34 treated  
as the same?
therefore traversing the firewall and going to whoever requested

again,
is there any way in which I can send a request to 2.34 and treat the  
response I am getting from 2.35 as coming from 2.34?

Thank you,

Andres

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