> From: [email protected] [mailto:[email protected]] > On Behalf Of Andrew Hume > > on the external VPN, we have 80 inbound feeds (10 per nodes) typically > around 23 Mbps each. > what we notice is that these socket connections occasionally go dry, that is, > data stops coming. > using tcpdump and sniffers, we determine that was because the server > starts sending > window size 0 messages back to the source systems. in fact, a sniffer > revealed > the window size starting around 26K and then quite quickly dropping all the > way down to 10, 8, 1 and then zero.
Apply your system updates. Make sure you're running the biggest best NICs available - there's a reason why they sell NICs for "desktop" and for "server" even though you might think "what's the difference?" And of course, they sell various levels of "server" nic. Get the biggest best ones. Apply firmware updates, and look for updated drivers from your mfgr. If all your boxes are a single brand and a single model, try injecting some other brands and models. The behavior you described isn't supposed to happen. You're experiencing a bug in something low-level. You might be able to simply make the problem go away with system & firmware updates, or swapping small(sic) pieces of hardware like the NIC. _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
