MTU size with VDSL in bridge mode

Dec 27th, 2020 7:38 pm

#1

elgros4 [OP]: Deal Addict; Sep 13, 2011; 1272 posts; 861 upvotes; Québec

Dec 27th, 2020 7:38 pm

Hi,

Does someone know how to do it ? I am unable to edit my SmartRG 505n configuration to lower the mtu size

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Dec 27th, 2020 11:24 pm

#2

alpovs: Deal Fanatic; Sep 16, 2013; 5536 posts; 3541 upvotes; SW ON

Dec 27th, 2020 11:24 pm

elgros4 wrote: ↑ Hi,

Does someone know how to do it ? I am unable to edit my SmartRG 505n configuration to lower the mtu size

If you are in bridge mode the MTU size is set in the router.

+1

Dec 28th, 2020 10:34 am

#3

elgros4 [OP]: Deal Addict; Sep 13, 2011; 1272 posts; 861 upvotes; Québec

Dec 28th, 2020 10:34 am

alpovs wrote: ↑ If you are in bridge mode the MTU size is set in the router.

I don't use a router, I connect directly with windows pppoe, so the Mtu would be set in windows ?

Dec 28th, 2020 1:24 pm

#4

alpovs: Deal Fanatic; Sep 16, 2013; 5536 posts; 3541 upvotes; SW ON

Dec 28th, 2020 1:24 pm

elgros4 wrote: ↑ I don't use a router, I connect directly with windows pppoe, so the Mtu would be set in windows ?

Then, yes. MTU is applicable to the PPPoE protocol for the connection established by your Windows PC. The modem in bridge mode won't have anything to do with it. I don't know for sure but I guess Windows would use the proper MTU of 1492 because it is standard for PPPoE. You can test if you already have the correct MTU set by pinging:
https://kb.netgear.com/19863/Ping-Test- ... -on-Router
https://www.pcwdld.com/ping-mtu

+1

Dec 28th, 2020 2:03 pm

#5

elgros4 [OP]: Deal Addict; Sep 13, 2011; 1272 posts; 861 upvotes; Québec

Dec 28th, 2020 2:03 pm

alpovs wrote: ↑ Then, yes. MTU is applicable to the PPPoE protocol for the connection established by your Windows PC. The modem in bridge mode won't have anything to do with it. I don't know for sure but I guess Windows would use the proper MTU of 1492 because it is standard for PPPoE. You can test if you already have the correct MTU set by pinging:
https://kb.netgear.com/19863/Ping-Test- ... -on-Router
https://www.pcwdld.com/ping-mtu

Thanks, I have solved my bug. I did a test with the modem directly with mtu 1492 and it work.

Then, I replug my router and change the default TP-link MTU of 1480 to 1492, and now my cisco anyconnect vpn from work is now super fast.

Thanks, 1492

+1

Dec 29th, 2020 7:05 pm

#6

wally_walrus: Deal Addict; Oct 19, 2007; 1701 posts; 593 upvotes; 45.467253°N, 75.5123…

Dec 29th, 2020 7:05 pm

elgros4 wrote: ↑ I don't use a router, I connect directly with windows pppoe, so the Mtu would be set in windows ?

I strongly suggest not relying on Windows' firewall while directly connected to the open internet...

Dec 30th, 2020 11:33 am

#7

elgros4 [OP]: Deal Addict; Sep 13, 2011; 1272 posts; 861 upvotes; Québec

Dec 30th, 2020 11:33 am

wally_walrus wrote: ↑ I strongly suggest not relying on Windows' firewall while directly connected to the open internet...

I used this:
https://www.evorim.com/en/free-firewall

Never had a virus in 15 years.

Dec 30th, 2020 5:26 pm

#8

wally_walrus: Deal Addict; Oct 19, 2007; 1701 posts; 593 upvotes; 45.467253°N, 75.5123…

Dec 30th, 2020 5:26 pm

elgros4 wrote: ↑ I used this:
https://www.evorim.com/en/free-firewall

Never had a virus in 15 years.

Firewall is needed for way more then protection against viruses...

Dec 30th, 2020 5:33 pm

#9

elgros4 [OP]: Deal Addict; Sep 13, 2011; 1272 posts; 861 upvotes; Québec

Dec 30th, 2020 5:33 pm

wally_walrus wrote: ↑ Firewall is needed for way more then protection against viruses...

by virus, I meant any form of malware.