I've added this text to the release notes (wiki notation): == TCP timestamps ==
Linux 2.6.27 now sets the timestamps option in TCP packets ([[http://www.ietf.org/rfc/rfc1323.txt|RFC 1323]]), an option dating from 1992 to improve performance over high-bandwidth-times-latency paths and to improve reliability over high-bandwidth paths, which was previously omitted by mistake. However, this change appears to cause problems for some users, believed to be due to buggy routers between the user and the destination server (for example, this has been reported by several Verizon DSL users). If your Internet connection mostly appears to be working correctly, but you have problems connecting to certain sites, then try the following command: {{{ sudo sysctl -w net.ipv4.tcp_timestamps=0 }}} This change will normally expire the next time you restart your computer. If it fixes the problem, then you can make the change permanent by running `sudo editor /etc/sysctl.conf` and adding the following line to the end of that file: {{{ net.ipv4.tcp_timestamps = 0 }}} The real bug here is in your router (if you own one) or your ISP's routers. If a firmware upgrade is available for your router, follow your manufacturer's instructions to upgrade it. Otherwise, contact the support department of your router manufacturer or your ISP for further advice. See [[https://launchpad.net/bugs/264019|bug #264019]], and thanks to [[http://wiki.mandriva.com/en/2009.0_Errata#TCP_timestamps|Mandriva]] for their clear documentation of this issue. ** Changed in: ubuntu-release-notes Status: Triaged => Fix Released -- unable to visit some websites and ftpsites with 2.6.27 https://bugs.launchpad.net/bugs/264019 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
