Jumbo frames on Axxess (on OpenServe)

[georgelza]

So curious... there is allot of YT videos out there that implies you can supercharge your internet speed by address MTU size...

Has anyone attempted increasing their MTU size on OpenServe (and Axxess as ISP)

G

 

[Leno]

I have only personally seen Jumbo frames on AWS, probably for storage reasons , never seen the capability on end user lines here

Everyone on the path will need to support it , doubt an ISP would enable it and risk having one link somewhere on their / FNO's network with a lower mtu which would cause headaches

 

[Leno]

Would be curious if the FNO's run at 1522 or higher to support the ISP VLANS etc

 

[georgelza]

@PBCool

comment.

G

 

[eddief1]

I guess ill try start, all FNO's would be different that is for sure.

FNO's who do L2 would probably allow the ISP to pass a full 1500 packet, the VLAN tags will get added on top of that on ingress so still a 1500 packet - theoretically if running PPPoE (8) encapsulation the max MTU should be 1492, you will see most ISP's on 1480 ?

You on OS - That is different, they use a LAC/LNS config, so you dial PPPoE, they then switch the PPP frames into a L2TP UDP tunnel - so in theory max MTU of 1460 ?

You basically need the ISP to tell you, as for example the FNO's could just enable jumbo frames on their switches and all of the above goes out of the water

An interesting one - The older Calix ONT's were 1500 - 4, 1496 . The 2x VLAN tags were overhead, so with PPPoE it was 1488 - that caught many out.

 

[georgelza]

guys, did everyone miss that this is posted under ADSL/VDSL... and since all ADSL/VDSL is actually on Openserve... so I'm not talking about what the FNO's do/able to do... we can def have the same conversation there, def be of value, but I'm expecting the configurations on copper and fiber to be different.

G

 

[websquadza]

I wouldn't expect any benefit of a larger MTU on L3 to be honest; most L3 services and servers run at 1500 bytes (what is generally considered a standard frame); so I don't see them changing that anytime soon (for a host of reasons, the least of which is the MTU issue that it would present). Speeds on DSL would also definitely not benefit - even for 1-2.5 Gbps fibre it would offer no benefit whatsoever. It has a great place on L2 core networks, passing VLANs, using overlay and underlay topologies such at EVPN and more.

Finally a big reason for most broadband providers not to use it is the risk of their networks being used as underlays. Most explicitly limit broadband services to 1500 bytes for this very reason.