Our sysadmin put my machine on a different net yesterday and for the new net I must use dhcp, so I changed eth0 to dhcp in system-config-network, deactived it and reactived it. After that it got an IP fine, but it didn't set a default gateway, /var/lib/dhcp/dhclient-eth.leases showed that the dhcp-server did provide one. Much debugging has lead me to /sbin/dhclient-script (so I might have selected the wrong component for this bug). /sbin/dhclient-script contains: if [[ ( ( -z "$GATEWAYDEV" ) || ( "$GATEWAYDEV" = "$interface" ) && ( ( -z "$GATEWAY" ) || ( ( -n "$DHCLIENT_IGNORE_GATEWAY" ) && ( "$DHCLIENT_IGNORE_GATEWAY" = [Yy]* ) ) ) ]]; then for router in $new_routers; do add_default_gateway $router && break; done Because I changed my ipconfig in system-config-network from static to dhcp /etc/sysconfig/network-scripts/ifcfg-eth0 still contained a GATEWAY=x.x.x.x line and system-config-network did not add a DHCLIENT_IGNORE_GATEWAY=Y line, so dhclient-script tried to set my gateway to the gateway for the old static config. I believe the proper fix for this for system-config-network to add DHCLIENT_IGNORE_GATEWAY=Y to /etc/sysconfig/network-scripts/ifcfg-eth0 if one selects dhcp. Or /sbin/dhclient-script needs to be changed. For now I've worked around this by reselecting static clearing the gateway editbox and then reselecting dhcp again, save, ifdown, ifup, fixed.
Also reported in bug #155299 . IMHO this is not initscripts bug that it sets gateway according to dhclient first and than sets the one from initscript as it should be intentional to overide dhcp settings. s-c-network should either remove this line (GATEWAY) from the config file or use the above line to supress the gateway setting.
I agree (this is a s-c-network bug), hence I selected it as a component. The fix is obvious: Add DHCLIENT_IGNORE_GATEWAY=Y when dhcp is selected in s-c-network. This is better then removing GATEWAY, since the othersettings are kept by s-c-network (although greyed out), so keeping gateway too seems consistent this also allows for easy switching between dhcp and a static IP. Since the fix is obvious can this be fixed please?
*** This bug has been marked as a duplicate of 149780 ***