imported>ThorstenStaerk |
imported>ThorstenStaerk |
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| − | This article describes what you can do if you have network problems. We will first identify the problem and then solve it.
| + | Show all lines that do '''not''' contain blabla |
| − | | + | grep -v blabla filename.txt |
| − | = Do you have an IP address =
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| − | Find out if you have an IP address
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| − | ip addr
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| − | If you do not have an IP address, fix this problem before proceeding.
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| − | We assume your IP address is 192.168.0.2
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| − | | |
| − | = Can you reach your computer =
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| − | Find out if you can reach your own computer
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| − | ping 192.168.0.2
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| − | = Do you have a standard gateway =
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| − | If you can ping all computers in your network but not any computer in the internet you probably don't have a gateway configured. Find out with the [[command]] [[route]] like this:
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| − | # route
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| − | Kernel IP routing table
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| − | Destination Gateway Genmask Flags Metric Ref Use Iface
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| − | <font color=blue>192.168.0.0 * 255.255.255.0 U 0 0 0 eth1</font>
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| − | link-local * 255.255.0.0 U 0 0 0 eth1
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| − | loopback * 255.0.0.0 U 0 0 0 lo
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| − | <font color=blue>default 192.168.0.1 0.0.0.0 UG 0 0 0 eth1</font>
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| − | The first blue line means: If there is any IP package for an IP address 192.168.0.*, just send it over network device ''eth1''. The second blue line means: Every IP package that has not been handled yet, send over network device ''eth1'' to the default gateway 192.168.0.1.
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| − | = See also =
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| − | * [[TroubleShooting]]
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| − | * [[NetWork]]
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| − | * [[TroubleShooting Sound]]
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| − | * [[iptraf]]
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| − | * [[ethtool]]
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| − | * [[nmap]]
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| − | * [[telnet]]
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| − | * [[netstat]]
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Revision as of 12:30, 28 April 2009
Show all lines that do not contain blabla
grep -v blabla filename.txt
