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Problem with DNS when external Load Balanced change the WAN (ISP) service.

Miguel Cruz

HI, Good Day.

 

I have a TL-ER5120 v2.0 (firmware 1.0.8 Build 20140212 Rel.36037) that gives DHCP and Internet to my Sophos XG Firewall (SFVH - C010018P2GDHJ37, firmware SFOS 17.0.3 MR-3), Im attaching some pictures. With my main router (the Tp-Link) i set the bandwidth control for ip groups on my network, thats the only reason i use it, cuz i understand this Sophos Firewall doesnt do that (badwidth control by ip groups), anyways when WAN1 go off or fail, the router connect the WAN2 port, so if im directly connected to the router everything works, but when im through the Sophos Firewall, It doesnt work, i imaging that the firewall doesnt manage very well the DNS cuz Google Chrome shows me the message "ERR_CONNECTION_RESET" or "DNS_PROBE_FINISHED_NO_INTERNET", so i dont know what to do, is there anyway i can fix this? or any idea? thanks a lot.

 

Mike.

 



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    The issue is not caused by XG's DNS management, but by your network design. The issue is that the XG is still trying to use the the first link because it has not failed eg the link between the XG and the router is still active. You cannot do load balancing without allowing the XG to see if links are active or not.

    Ian