I have been using UTM for many years now... 6+? When I first started, there were issues with certain Intel nics when used with DHCP and Cable Modems.
Lately, I have been having problems again. I have had MANY calls with my ISP, I even went ahead and bought new hardware for my UTM. Same problem. I rarely get an IP address from my ISP and when I do, the external interface will only stay "up" for a brief period - and then drop again.
I plugged my "Gateway desktop" directly into my Cable Modem and it ran without an issue for 3 days. Then I added an ASUS RT-N66 in as a "router". That ran fine for a week - with A LOT of traffic going through it.
I add the UTM and BAM! I am back down again.
My question is - WHERE do I begin to troubleshoot this? confd logs? TCPDUMP? My UTM seems happy to get a DCHP address from my ASUS if I test it that way... I don't want to bail on Sophos, but I don't know what else to do. Many years ago, I put an old router between my Cable Modem and my Sophos machine. I really don't want to do that again.
UTM 9.355-1
External NIC is an Intel Gigabit PCIe EXPI9301CT
Quad core i3 with 4GB RAM, 160 GB HDD
Thoughts? Advice, Similar issues?
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