* David Newman <[EMAIL PROTECTED]> [2007-08-23 01:30]: > >> Also, I noticed today that Google marks all their stuff with a DSCP of > >> 0x38 (high throughput, low delay). Nice trick, but also an excellent > >> argument for re-marking capability in all routers. > > > > nice trick? rather useless. I'd be extremely surprised if it makes any > > difference at all. > > i mean, who is really > > 1) looking at DSCP/TOS at all, > > - and - > > 2) using them for different forward9ng priorities > > - and - > > 3) has congestion/fwd capa shortage so that it actually makes a > > difference, > > - and - > > For various reasons I can't name names, but I can tell you that there > are some VERY large service provider and enterprise networks using DSCP > classification and prioritization.
yes, sure, within their networks. > ISPs tend to run at much higher utilization levels than enterprises and > congestion is a reality on at least some of their pipes. i know the ISP market very well, and I have yet to see that. at least in europe, basically everybody has spare capacity like beer on weekends. > And even in the absence of congestion, there's still a desire to service > delay- and jitter-sensitive voice and video ahead of other traffic. true. I have my doubts wether all this tos/dscp dance really makes much of a difference there, but yes, it can help. > > 4) trusts externally set TOS/DSCP > No one should trust external TOS or DSCP markings. Again, what Google is > doing is an excellent argument for re-marking capability in all routers. yup, i agree. > And here we come full circle. Given the OpenBSD now IS a router -- > whether it's a little two-interface pf box for home use or some big > studly hardware running OpenBGPD and OpenOSPFD box for ISPs, I would say > the addition of support for DSCP re-marking would be a very desirable > feature. i'd call it a nice-to-have, yes. -- Henning Brauer, [EMAIL PROTECTED], [EMAIL PROTECTED] BS Web Services, http://bsws.de Full-Service ISP - Secure Hosting, Mail and DNS Services Dedicated Servers, Rootservers, Application Hosting - Hamburg & Amsterdam
