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Misleading telnet information MSS-MTU

  • cameltoe
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15 Oct 2011 19:14 #69700 by cameltoe
Misleading telnet information MSS-MTU was created by cameltoe
My ISP Be* recommends an MTU setting of 1500. So I looked online on how to set the MTU and got to

Vigor> wan mtu 1500

However when this is set I type in
Vigor> wan mtu ?

and get the reply
Static IP/DHCP (Max MSS: 1500)
PPPoE(Max MSS: 1492)
PPTP/L2TP(Max MSS: 1460)
% wan ppp_mss
% Now: 1500

But hold on.... isn't the MSS = MTU - 40 and why is it showing MSS when I wanted to set the MTU?
% Now: 1500 is this the mss or the MTU???????

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17 Oct 2011 12:30 #69709 by nealuk
Replied by nealuk on topic Re: Misleading telnet information MSS-MTU
This article may help: http://www.draytek.co.uk/support/kb_vigor_mtu.html

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20 Aug 2013 14:59 #77481 by ollyadmin
Replied by ollyadmin on topic Re: Misleading telnet information MSS-MTU
wan ppp_mss will not work with a 2820 or 3200 draytek so this article it incorrect.

what if the mss needs to be 72 less than the mtu ?

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20 Aug 2013 22:21 #77485 by babis3g
Replied by babis3g on topic Re: Misleading telnet information MSS-MTU
http://www.speedguide.net/articles/mtu-what-difference-does-it-make--111

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