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tcp/ip gateways, windows default routes,

By jj ·
here is a real fun one i met the other day - an although I have a fix - i thought I post it anyway for comments / confirmations that my theories are right.

.under what circumstances an IP gateway can become 'promiscuous' ? Is it a normal condition for gateways to advertise themselves (and thus have the ability to override your Windows IP settings (in this case licensed with DHCP)

The we have been upgrading the LAN backbone here and as such, have added and Intel fibre patch/hub - which seems to advertise itself as a gateway (which it isn't) - or at least respond quicker than the existing default gateway. This causes your PC to learn that this is the new route - and installs it as the 1st choice in the route list (some else I didn't know your PC does....type ROUTE PRINT at the dos prompt and woweee.)

The fix is either manually edit this pc-based routing table, or renew your dhcp licence, or reboot your pc.

Maybe it's the norm but I a) never knew gateways behaved or couldbehave like this and

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tcp/ip gateways, windows default routes,

by alaminet In reply to tcp/ip gateways, windows ...

Yes, there is a possibility of your windows IP being overriden.

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tcp/ip gateways, windows default routes,

by jj In reply to tcp/ip gateways, windows ...

guess work

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tcp/ip gateways, windows default routes,

by isys In reply to tcp/ip gateways, windows ...

Are your routers using OSPF routing? That's what this sounds like. You should be able to configure the hub to not act like a gateway. If not, you should be able to assign it a cost high enough for the other routers to choose a different path.

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tcp/ip gateways, windows default routes,

by jj In reply to tcp/ip gateways, windows ...

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tcp/ip gateways, windows default routes,

by simpsin In reply to tcp/ip gateways, windows ...

Routers do advertise themself's but that shouldn't over-ride the original settings. The only possibility I see it's beacause of the DHCP. Check if your hub awnsers dhcp requests.Also check if the original router address is not being over-written in the dhcp server.
Most of the "route" , "arp" "net" and other comands are in the Network Stack of microsoft and UNIX. they are the same for Win9X, NT, UNIX (they are worth checking out, there are a couple of very usefull commands)

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tcp/ip gateways, windows default routes,

by jj In reply to tcp/ip gateways, windows ...

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tcp/ip gateways, windows default routes,

by jj In reply to tcp/ip gateways, windows ...

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