Hi David, On Jan 7, 2014, at 13:11 , David Personette wrote: > I was going to test the recommended bridge settings for overhead (32 IIRC), because as far as I can tell there is no PPPoE involved. I've never seen it in the modems config (in the brief period it has an IP before I put it in bridge mode as well so the routable IP goes to my actual router), or needed to configure it on my router. Ah, so there are 2 major variations of "bridged": 1) LLC/SNAP: Bridged - 32 (ATM - 18, ethernet 14, possibly FCS - 4+padding) 2) VC-MUX: Bridged - 24 (ATM - 10, ethernet 14, possibly FCS - 4+padding) (he FCS padding potentially turns this into 4 variations, but it should be really rare, or so I heard). You could just slowly reduce the overhead and see how the link behaves; honestly I do not know how prominent a slight overhead underestimate would feel, so by all means go ahead and try :). If you have a mac or linux computer on your network, you could try to measure the overhead with the attached ping_sweeper5_dp.sh script (needs editing). Then you could run tc_stab_parameter_guide_04.m in matlab or octave (on the matlab command prompt change into the directory containing the script and the log file run "[ tmp ] = tc_stab_parameter_guide_04( fullfile(pwd, 'ping_sweep_ADSL2_20140104_122844.txt'))" ; make sure to replace ping_sweep_ADSL2_20140104_122844.txt with the name of your log file. The measurement will take around 3 hours (for 10000 samples per size, for your link 1000 would be enough) and wants an undisturbed network (I typically run this over night); the parsing of the log file will also consume 20 minutes or more, the actual analysis will take a few seconds… If you go that route I would love it if you could share your log file, since I only have one old bridged LLC/SNAP example. (I intend to put all scripts and an instruction on the wiki, with example plots for the different results). Best Regards Sebastian