Hi Guys

I know MTU gets covered a lot, and I have a fair understanding of it but I am still not sure if I have it configured optimally.
My ADSL modems are pre configured by Telkom with an MTU of 1492 - so I guess thats their optimal value. I plug my modems into a dual WAN load balancer, whose MTU settings are set to 1500 on both WAN interfaces and on the single LAN interface. I assume that is correct or should I say makes no difference as long as its set higher than the 1492 of the modem.

The LAN interface is then plugged into a Mikrotik Router 3.24 whose WAN (public) interface is also set to 1500, and the local interface is also 1500 however the pppoe server I have set on the local interface is the default Mikrotik MTU pppoe server setting of 1480.

The local interface is plugged into another Mikrotik Device on the roof with 3 antennae's, each interface is set to its default 1500, and I have UBNT nanostations connecting to these radio's. The Nano's MTU setting on its wan port should be 1480 when its configured as a pppoe client, or should it be less? If it was configured as a bridge can the MTU also be 1500 as long as the clients home "router" (say for example a netgear broadband router) that plugs into the nano is configured with a MTU of 1480 or less?

I assume the MTU of the devices between pppoe server and pppoe client can have greater MTU settings of the pppoe server it self as the tunnel that gets created is between the client and the server and the equipment used to carry that connection is basically a bridge?

I have about 40 clients and most of my equipment is Mikrotik, and I really like and try to support them as much as possible, but I havent had time to go for training but really need some good advice as to fine tuning this setup. Please if any body can point out the best config for this setup that would be greatly appreciated.

Thanks in advance

Basil
Everything seems to be workin

hhhmmmm, not a single reply in over a week?

Come on guys / girls, someone must be able to advise me on the correct approach.

Please, anyone?

Kind Regards

Basil

We had sim problems. We left the nework @ 1500 and set the ethernet mtu to:

1350 or 1320.
All work well after this.

Iburst did the same