Workstation using assigned ISP

Ken Graser
Ken Graser used Ask the Experts™
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I'm running a Sophos XG 115 with dual ISPs (Comcast and AT&t) in balance mode.  That all works fine.  However I have one user (the Boss) who wants his workstation to always use Comcast (some of the sites he using require Comcast login).  

My question is:
Is there any way that I configure his workstation to only use the Comcast connection and not the AT&T connection?
Or is this something that has to be set up in the Sophos?

All of my workstations are using Static IPs.  

Any assistance would be appreciated.

Thanks
Ken
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NoahHardware Tester and Debugger

Commented:
Hi there! :)

You need to create a DNAT. You may refer to the following article for step by step instructions recommended by the official Sophos Support team.

Reference: https://community.sophos.com/kb/en-us/122976

122976-diagram.png
Fractional CTO
Distinguished Expert 2018
Commented:
You can create a manual route. Noah suggests one way to do this.

And, normally this is a bad idea.

Most network devices which aggregate several ISPs will load balance, also using QOS, to ensure fastest or most stable packet flow for every protocol.

If you force one/some computers to force packet flow through one ISP, all this logic is broken.

Many times this causes connections to run slow or just stop, as a forced ISP packet flow slows or stops.

Creating manual routes breaks the entire reason for running an ISP aggregator.

Tip: These devices are always smarter than human guessing, so best let your devices do their job, rather than work around them.
Ken GraserIT Manager

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Commented:
Noah,
Thanks for the info on doing the DNAT.  I do think that would work however I need to do some testing to see what impact this would have on the load balancing etc.

David,
You gave me some good advice and I can see where that could cause problems.  I just have to think of a good way to tell the Boss that he will have to live with it.  My network is working well and I don't want to mess it up.
Thanks

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