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Ubuntu Linux 11.10+Firefox 18.0+intermittant disconnects when contacting sites+?no IPv6 routers, eth0 is up

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Desktop has dual boot with Windows 7 (32 bit) and Ubuntu Linux 11.10 (64 bit) with electronic HD ~120 GB. The partitions allow sharing so that Linux can access Windows disk space by using /host/ubuntu... Firefox also used on Windows 7 (this always works). With Ubuntu on boot, I can ping my ISP server ok. On some days attempting to use Firefox (usual or safe-mode) to connect to (any) site will result in a very short connect (maybe one second) followed by a disconnect, and then I can't ping or connect anything until reboot (powercycling the DSL modem does not help). Also, dmesg does not show any error when the connection problem occurs. However, there is a message "no IPv6 router present" and looking up ipv6tables using man help ... suggests there are many flags, settings, in the linux kernel that could be reset when Firefox tries to connect. Perhaps you can suggest which logs might indicate when the trigger gets set by the Firefox (or the kernel). I have tried to resolve the problem by wiping extensions, plugins, hdw accel, etc. I have no idea what I have done (previously) to restore operability...need ability to trace.

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  • User Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20100101 Firefox/12.0

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