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Standard User Pheasant
(experienced) Fri 30-Apr-21 14:23:13
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Re: Router hardware capable of routing 900mbps over PPPoE (F


[re: candlerb] [link to this post]
 
In reply to a post by candlerb:
In reply to a post by Pheasant:
I ran a path MTU check over the PPPoE link by using the don’t fragment ping check trial and error method and it came to 1452. The actual MTU setting for the link is 1480.


That's strangely low. Without tweaks, I would expect MTU 1492 for a PPPoE interface (1500 - 8 byte PPPoE header). You're not running a VPN or anything like that over it?

Also, how are you testing? Using Linux:
ping -Mdo -s1472 x.x.x.x # => MTU 1500 (20 bytes IP header + 8 bytes ICMP header + payload)

Apologies! Upon investigation PPPoE link MTU was weirdly set as 1480 on the router i/f and should have been set as 1492 for the PPPoE link. With that said ping testing to 8.8.8.8 with a 1464 MSS/payload gives the expected result of 1492 on the PPPoE uplink.

Via IPsec the MSS/payload is 1398 or an MTU of 1426.
Standard User candlerb
(fountain of knowledge) Fri 30-Apr-21 18:35:49
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Re: Router hardware capable of routing 900mbps over PPPoE (F


[re: Pheasant] [link to this post]
 
To do baby jumbos on Mikrotik:

Text
1
23
45
/interface ethernet
set <N> l2mtu=1526 mtu=1508 
/interface pppoe-clientset <N> max-mru=1500 max-mtu=1500


(P.S. To be strictly accurate, MSS refers to TCP segment size, not ICMP payload. IPv4+TCP header combined are usually 40 or 48 bytes, depending on whether the TCP timestamp option is present; so if you have IP MTU 1500 then the TCP MSS is 1460 or 1452. It's lower on IPv6 because of the larger IP headers)
Standard User nofappingway
(newbie) Tue 04-May-21 19:33:41
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Re: Router hardware capable of routing 900mbps over PPPoE (F


[re: mikehiow] [link to this post]
 
Personally I use a Draytek 2850ac that's connected to a symmetrical gigabit FTTH connection from Hey! Broadband and a 75Mb vDSL from Plusnet simultaneously.

It runs both at full speed without issue in parallel.


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Standard User smouty
(member) Wed 05-May-21 12:22:18
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Re: Router hardware capable of routing 900mbps over PPPoE (F


[re: nofappingway] [link to this post]
 
Impressive for 10 year old hardware wink

Still using one of these at work but only for dsl.

OPNSense
PiHole
Unifi for Wifi
Standard User nofappingway
(newbie) Wed 05-May-21 12:32:35
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Re: Router hardware capable of routing 900mbps over PPPoE (F


[re: smouty] [link to this post]
 
Doh! Typo. Not a 2850.....and 2865 smile

Edited by nofappingway (Wed 05-May-21 12:33:48)

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