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ifconfig

Posted on 1998-12-21
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Last Modified: 2012-05-04
I loaded RedHat 5.1 v2.0.36 and the only way I can get networking to work is if I manually enter the following two commands:

ifconfig eth0 192.168.1.100
route add -net 192.168.1.0

Without these commands ping produces the following error:

ping sendto: Network is unreachable


What am I missing?
Which configuration file do I need to update?
What commands do I need to add in these files?
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Question by:4crash
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Accepted Solution

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NetDudeFL earned 50 total points
ID: 1587956
Edit /etc/sysconfig/network-scripts/ifcfg-eth0 (or whatever device)

DEVICE=eth0
IPADDR=*insert IP address here"
NETMASK=*insert netmask here*
NETWORK=*insert network address here*
BROADCAST=*insert broadcast address here*
GATEWAY=_insert gateway address here*
ONBOOT="yes" = interface will be active at boot time.
       "no"  = interface will NOT be active at boot time.

.If you have X-Windows set up, you can also use RH's "Network Configurator" (/usr/bin/netcfg) which actually writes to these files.

Additionally, after editing the file, do a "ifup eth0" to activate it and ifdown eth0 to deactivate it.

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Expert Comment

by:ahoffmann
ID: 1587957
> ping sendto: Network is unreachable
usually just misse your route command

I'm not used to RedHat, but you either should have a configuration file somewhere in /etc
wher the interface eth0 is specified. Ifconfig eth0 ... usually adds the netroute automatically (seems not to be for RedHat):
If you can not find such a file check the rc startup files in /etc.

(leaving a step-by-step answer to a RedHat expert:)
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Author Comment

by:4crash
ID: 1587958
I checked my ifcfg-eth0 file and it is correct. lo (loopback) is enabled during bootup but eth0 is not.  Once booted, "ifup eth0" does enable eth0. However it takes about 45 seconds for "ifup eth0" to return "search localdoman" to the command line and provide network funcionality.  Should "ifup eth0" be inserted in a config file?
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Expert Comment

by:NetDudeFL
ID: 1587959
The "onboot=yes" in /etc/sysconfig/network-scripts/ifcfg-eth0 will indicate that it is done at bootup, it is not needed to be manually inserted.  The 45 second delay is odd.  You don't have a 3Com 3C905TX in that box by chance, do you?
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Expert Comment

by:hnminh
ID: 1587960
You also can use linuxconf command to setup your network config needn't to have X-Windows.
Cheers
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Author Comment

by:4crash
ID: 1587961
dmesg shows:
eth0: 3Com 3c589, port 0x300, irq 3, Auto Port, hw_addr 00:00:86:19:AE:CB

However ifconfig still just lists "lo" until I run ifup eth0.
After running ifup eth0 ifconfig lists "lo" and "eth0". I checked again and ONBOOT=yes.

Also, I am using a 3CXEM556 pc card.
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