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Debian GNU/Linux Reference Guide
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10.11 Network troubleshooting

If you encounter problems then check the output of the following as the first reality check:

     # ifconfig
     # cat /proc/pci
     # cat /proc/interrupts
     # dmesg | more

Also see the sections following Network testing basics, Section 8.6.29.

If you have problems with certain websites, see Strange access problems with some websites, Section 3.8.5.

Debian GNU/Linux Reference Guide
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