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| ubuntu:debugging_networking_problems [2014/08/12 10:53] – created doug | ubuntu:debugging_networking_problems [2014/08/12 10:57] (current) – doug |
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| ===== Debugging networking problems ===== | ===== Debugging networking problems ===== |
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| I run into this crap all the time with the ''/etc/network/interfaces'' file. Maybe something isn't working correctly, or maybe Ubuntu gets stuck during booting at "Waiting for network configuration" for a few minutes. | I run into this crap all the time with the ''/etc/network/interfaces'' file. Maybe your static IPv6 addresses aren't getting added to your network interface, or maybe Ubuntu gets stuck during booting at "Waiting for network configuration" for a few minutes. |
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| Usually a problem like this is due to a misconfiguration in ''/etc/network/interfaces''. Here are some tips I've learned about the interfaces file: | Usually a problem like this is due to a misconfiguration in ''/etc/network/interfaces''. Here are some tips I've learned about the interfaces file: |
| * "iface eth0 inet static" and "iface eth0:0 inet static" both had a gateway supplied. Multiple gateways don't work, so remove it from one. This can also be a problem if both eth0 and eth1 have a gateway, for example. | * "iface eth0 inet static" and "iface eth0:0 inet static" both had a gateway supplied. Multiple gateways don't work, so remove it from one. This can also be a problem if both eth0 and eth1 have a gateway, for example. |
| * Under "iface eth0 inet6 static", there was a /64 at the end of the "address" line, but the /64 is already automatically added because of the "netmask 64" line. Thus, the setup command had /64/64 at the end of the IPV6 address, causing a failure. | * Under "iface eth0 inet6 static", there was a /64 at the end of the "address" line, but the /64 is already automatically added because of the "netmask 64" line. Thus, the setup command had /64/64 at the end of the IPV6 address, causing a failure. |
| * ''/etc/network/interfaces'' is very picky about indentation and spaces--[[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=528095|possibly only when Network Manager is involved]]. I think other mechanisms that use the file aren't picky, but Network Manager seems to be. This has caused problems on my desktop computers if I indent a line with four spaces instead of tabs, for example. | * ''/etc/network/interfaces'' is very picky about indentation and spaces–[[https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=528095|possibly only when Network Manager is involved]]. I think other mechanisms that use the file aren't picky, but Network Manager seems to be. This has caused problems on my desktop computers if I indent a line with four spaces instead of tabs, for example. |
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