Red Hat Bugzilla – Bug 51462
Network number and broadcast address not re-calculated when changing IP address
Last modified: 2015-03-04 20:09:33 EST
From Bugzilla Helper:
User-Agent: Mozilla/4.78 [en] (X11; U; Linux 2.4.6-3.1 i686)
Description of problem:
After post-installation re-boot, changing IP address of eth0 did change
the IP address in the config file, but did not re-calculate and change the
broadcast address and network number. The broadcast address is required
for proper ARP operation.
Steps to Reproduce:
1.Using GNOME choose Programs -> System -> Network configuration
2.Select device eth0 and press edit button.
3.select protocol tab and highlight TCP ( only protocol in my
4. click edit button.
5. Alter IP Address significantly - change the network number portion
of the IP address, not just the host within the network. Make sure to
change the subnet mask and gateway if needed. Save changes.
6. plug into new network then /etc/rc.d/init.d/network stop then start
7. try to reach site in an external network.
8. the file /etc/sysconfig/networking/devices//ifcfg-eth0 will not have
the proper values in it either.
Actual Results: The original broadcast address and network number remained
in the file:
Expected Results: New and correct broadcast address and network numbers
should have been in file:
Or maybe its just swamp gas.
We (Red Hat) should really try to fix this before next release.
Can you try the rpms available at http://people.redhat.com/teg/neat/ ?
OK, fixed in most recent version (0.7.4-2)
Read ya, Phil