On Thursday, May 31, 2012, shimi wrote: > On Thu, May 31, 2012 at 2:19 PM, Oleg Goldshmidt <[email protected]> wrote: > > On Thu, May 31, 2012 at 2:10 PM, ronys <[email protected]> wrote: > >> Looks like Walla's having electric problems at their servers: > >> http://www.globes.co.il/news/article.aspx?did=1000753302 > > > > FWIW, I get "connection reset" *all the time* from various Google > > services - gmail, news, search, maps, youtube. I stopped raising a > > brow, just hit the "try again" button. It never occurred to me to > > suspect Linux (this looks to me a Google-specific issue) - I thought > > those were glitches in Google's massive datacenters... Or maybe in > > some Israeli cache or whatever. > > More likely than a Linux's "fault", is faulty routers (or appliances) on > your path to Google's servers, that think they're smarter than Internet > endpoints, instead of just... routing traffic, what they were originally > supposed to do. Sometimes it's those "smart" QoS boxes... > > Recently I did a very long debugging session on a customer of > Netvision/Barak, and realized that their equipment doesn't like the > "advanced" features enabled by Linux by default - the behavior of the > ISP network changed as I modified the things below. I would start > echoing 0 to numerous stuff under /proc/sys/net/ipv4/* to see if the > problem alleviates.
If the problem is related to one of these features, would that explain the instances where I can get an URL with wget, but not access it from a browser ? > > Start with disabling: > > TCP Timestamps > TCP SYN Cookies > Window Scaling > Selective ACKs (SACKs) > > Also try MTU @ 1300 for the fun > > And if you have TCP Offloading... might want to disable that, too. It > could be your NIC / NIC driver. > > Good luck :-) > > -- Shimi -- The day is short, and the work is great, | Aharon Schkolnik and the laborers are lazy, and the reward | is great, and the Master of the house is | [email protected] impatient. - Ethics Of The Fathers Ch. 2 | 054 3344135
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