Static IP Address and Mail Server Woes

Posted on 2006-05-24
Last Modified: 2008-03-17
I have the following

Exchange 2003/ ISA 2004 / Linksys Router / DSL Modem
My ISP gave me 2 static IP addresses
I configured the DSL Modem with this Static IP
Then I configured the Router with the second static IP
The ISA Server is acquiring a dynamic address from the router.

Now whenever I ping the static IP of the router, I get the following error
Reply from TTL expired in transit.
Reply from TTL expired in transit.
Reply from TTL expired in transit.

Can I continue and set the public dns server to point to my mailserver for mail, or would this issue above cause any problems?

Question by:Christian_Agard
    LVL 2

    Expert Comment

    why is the router using the 2nd public IP?

    I take it the modem is hanging off the router? in which case use the public ip on the router and then also utilise a private static for ISA to another private static to exchange. that should eliminate the TTL expired.

    OR are you trying for a DMZ scenario? with modem public facing then sitting ISA in the DMZ (not the preferred way anymore) then the router with some natting of adresses to the internal network.
    LVL 1

    Author Comment

    No I have the Modem with a public IP, the Router with a public IP
    The Router giving the ISA an IP and the ISA is connected to the internal network.

    Will mail work in a situation like this where the ping requests are timing out like the above.
    LVL 104

    Accepted Solution

    If you bypass the ISA server, what happens then?

    You have too much in the way at the moment to accurately diagnose where the problem is.


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