Re: Router advice needed

"Eric" <nospam-01@xxxxxxxxxxxxxxxxxx> wrote in message news:ujuk73paq778j58qmo2h1d36jif889kdrj@xxxxxxxxxx
On Tue, 19 Jun 2007 16:53:38 +0100, "S W" <SW@xxxxxxxxxxxx> wrote for the entire
planet to see:
<snip>

Just one last thing. The first and most important step when expanding your LAN
subnet is to change the subnet mask on the router interface that has your default
gateway IP defined. This means that the router knows about the larger subnet right
away, and any host with an inconsistent subnet mask that incorrectly sends LAN-bound
traffic to the gateway router will still have their packet delivered, just detoured
in and out of the router's LAN interface. Then all the subnets on each of the hosts
and DHCP servers can be changed without gyrating the whole LAN.

I'd also recommend that you keep a few /24s of your new range unallocated. Probably
just start using 192.168.11.xxx and leave the other 6 /24s for the future.

Hi, yes I did do the router/default gateway first. I went live this morning, with all the DHCP devices in the 192.168.8.xxx range, leaving everything static as is on 192.168.10.xxx
No real issues, apart from an application that went belly-up. The third-party suppliers took about two hours to uninstall/reinstall, I don't think I'll ever know if it was because of the subnet mask change or just a coincidence!
I've now got lots of IP addresses free for the future.

Best Regards,
Steve

.

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