Cable Forum - View Single Post - VM Business New VM Business service

kev445 · 12-03-2018, 16:27

Hi Aps, it looks like your maximum MTU is 1300 (1272 + header of 28).

Usually your router would clamp the TCP MSS or fragment the packets (when PMTUD fails to work), however it doesn't look like this is working correctly currently.
Can you edit the MTU within the superhub? That may however cause more issues if the tunnel is before where the MTU is set, but I'd assume it's on the LAN ports?

Alternatively if you alter the MTU on your machines to 1300, you should find the internet starts working again.

12-03-2018, 16:27	#117
kev445 cf.member Join Date: Oct 2007 Posts: 78	Re: New VM Business service - 350Mb Hi Aps, it looks like your maximum MTU is 1300 (1272 + header of 28). Usually your router would clamp the TCP MSS or fragment the packets (when PMTUD fails to work), however it doesn't look like this is working correctly currently. Can you edit the MTU within the superhub? That may however cause more issues if the tunnel is before where the MTU is set, but I'd assume it's on the LAN ports? Alternatively if you alter the MTU on your machines to 1300, you should find the internet starts working again. Last edited by kev445; 12-03-2018 at 16:30.