Setting MSS

What's the best MSS value for networks that are connected to the Internet
via ADSL? Am I best to use the same value on all networks where data might
be routed to/from the ADSL modem? I seem to remember setting a 'clamp MSS'
option in Shorewall for dial-up, I take it I can drop that now?

Simon

Simon J. Rowe wrote:

> What's the best MSS value for networks that are connected to the Internet
> via ADSL? Am I best to use the same value on all networks where data might
> be routed to/from the ADSL modem? I seem to remember setting a 'clamp MSS'
> option in Shorewall for dial-up, I take it I can drop that now?

Setting 1478 MTU on clients is a bit more efficient than 1500 assuming
PPPOA - I thought MSS would be derived from setting MTU.

I suppose clamping MSS lets you force it on clients with a higher setting,
though IIRC there can be complications to doing this. I think there's a bit
in the LARTC on that.

Andy.

The MSS is the MTU minus 40

Andy Furniss wrote:

> Simon J. Rowe wrote:
>
>
>>What's the best MSS value for networks that are connected to the Internet
>>via ADSL? Am I best to use the same value on all networks where data might
>>be routed to/from the ADSL modem? I seem to remember setting a 'clamp MSS'
>>option in Shorewall for dial-up, I take it I can drop that now?
>
>
> Setting 1478 MTU on clients is a bit more efficient than 1500 assuming
> PPPOA - I thought MSS would be derived from setting MTU.
>
> I suppose clamping MSS lets you force it on clients with a higher setting,
> though IIRC there can be complications to doing this. I think there's a bit
> in the LARTC on that.
>
> Andy.
>
>
>
>
>