On Thu, 2007-08-16 at 14:46 -0700, Konstantin Svist wrote: > David G. Mackay wrote: > > I have a netopia 2241N dsl modem provided by my ISP (AT&T), which I > > access through an ethernet port. The unit can be configured in pass > > through mode so that the public internet address is bridged, i.e. my > > ethernet card is assigned the public address. This has been working > > well for some time now. > > > > There was a network outage the other day, and when service was restored, > > the gateway on the remote side had changed. The fun part is that the > > gateway is on a different class A ip net than my public ip. I can > > resolve all that by doing: > > route add -net e.f.g.h netmask 255.0.0.0 dev ethx > > route add default gw e.f.g.h > > where e.f.g.h is the external gateway ip. > > This borks up the /etc/sysconfig/network-scripts/ifcfg-ethx scripting. > > > > Is there a better way to handle this, other than kludging things in > > rc.local? > > > Normally, DHCP takes care of these little problems.. but if you're not > using it (and using static IP config instead), just use the GUI utility > system-config-network - it > should set all these values correctly It is a static address, so DHCP is not appropriate. And, I suppose, system-config-network would accept the gateway and ip addresses. The problem is that the gateway is on a different subnet than the ip by most normal networking rules. The modem doesn't show the netmask, so I suppose that AT&T might have CIDRed a couple of class A addresses together. But, without that, the gateway will be unreachable until you add the route add -net, which doesn't normally occur in the network init scripts. Dave
