Re: HFSC not working as expected

[Michal Soltys <soltys@ziu.info>]

On 2014-07-03 02:56, Alan Goodman wrote:
>
> Its a BT Business Hub 3, which I think is made by Huawei. Im not sure of
> the technical underpinnings of how a router in bridgemode operates
> beyond I set it to bridge mode and connect it to a device that does
> PPPoE and it 'just works'.

Hmmm, maybe the isp handles both pppoa and pppoe ?

>
> Do you have any examples (or links to correct examples online) of a good
> method of utilising 'tc-stab' ?  I have looked at the documentation and
> am feeling a little overwhelmed at the moment!
>

tc-stab essentially answers "what is the real length of packet being 
sent ? (later)". ATM cells are always 53 bytes long with 48 bytes 
payload - so the data send is divided in 48 byte packs, some 
atm/ethernert/ppp specific info (overhead) and padded to fit into 48*n size.

Assuming your link is actualle pppoe, the overhead would be 32 (vcmux) 
or 40 (llc) with 'linklayer atm' option. Then you can use the speed at 
which modem synchronizes (or well a tiny bit less to compensate for 
small variations) when using tc.