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Client cannot reach Server on ISP1 when using Uplink Balancing forcing ISP2

Hi,

we have a UTM active-passive Cluster with two Uplinks configured (ISP1=Uplink and ISP2=o2).

I have one Testclient which uses ISP2 and surf the Web without a Problem.

But it can't connect to a Server which is NATed on a public IP from ISP1

It can however reach Servers Protected with Webserver Protection on the UTM on ISP1

The Webserver Protection ant the NAT is working from all other ISPs for example my home Network.

This is the Multipath Rule for my Client

The Masquerading Rule:

And the Firewall Rule:

This is the NAT Rule to the Server i try to reach:

Do you have any Ideas where I can start Troubleshooting this ?



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  • FormerMember
    FormerMember 4 months ago

    Hi ,

    Thanks for reaching out to the Community! 

    I'd suggest you run tcpdump on destination IP address on UTM as well as review the packet-filter logs. 

    Thanks,

  • Hallo Marco,

    I'm confused.  Is your #5 Multipath rule binding outbound traffic from "o2 (Network)" to the "O2" interface?  is "o2" a LAN interface?  Is "O2" an interface with a public IP and a default gateway?  What is whited out in Multipath rule #4 - the Testclient?

    You wrote:

    "I have one Testclient which uses ISP2 and surf the Web without a Problem.

    "But it can't connect to a Server which is NATed on a public IP from ISP1"

    Is the Testclient in "o2 (Network)"?  Is ISP2 on the "O2" interface?  When you say "can't connect," what do you see - an error message or just no response?

    Have you tried a NAT rule like the following?

         Full NAT : Testclient -> (HTTP/S & Zenworks-Joinproxy) -> ISP1 (Address) : from o2 (Address) to server

    Cheers - Bob

     
    Sophos UTM Community Moderator
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