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[wisspa]

Hi, newbie here.  Have a question I hope someone can help me with.  Had Zen fibre 1 installed a couple of days ago and was given a BT ECI modem and had already bought the Asus RT-N66U router.  Discovered the cab is a Huawei cab and have found a new unlocked Huawei HG612 3B modem on Ebay.  Would like to swap the Huawei for the ECI but have noticed that the Huawei HG612 use the same IP address, 192.168.1.1 as the Asus router.  Am sure that it is not a very good idea to leave it that way.  Can I change the IP address of the Asus router and, if so, how do I do it?  Simple explanation please if pos.  Many thanks.

[Weaver]

No need to worry about this. It really isn't a problem.

[Weaver]

Btw the router has (at least) two IP addresses.

[wisspa]

Thanks for your reply.  Will the router switch to the 2nd IP address automatically if the modem is using the 192.168.1.1 address?

[Dray]

You can change either the modem's address or the router's address through their web interface. It's a bad idea to have 2 devices with the same IP address on the same network

For the modem go to Basic > LAN on the web interface and change it there. If you're using DHCP to automatically assign addresses, ensure the IP address you choose is outside the range that DHCP allocates.

[Bowdon]

The router might detect an IP conflict on its own.

But as said previously, you can change the IP on the router.

It's in the LAN option on the left side menu. I have my IP set to 192.168.1.2

[roseway]

You certainly don't want the modem and the router on the same IP address if you want to monitor the stats.

[Weaver]

@wisspa - apologies, I just read how that might have sounded ambiguous.

The router has up to two simultaneous IPs, one for the interface that faces in towards the (W)LAN, wired plus wireful combined, and possibly another for the (very small) LAN that is just the network cable to the modem. [oversimplified]

I'm assuming that you talk to the modem using PPPoE. The network cable to the modem is a second, separate, very small LAN in itself, I say very small because there are only two IP addresses on it, the address of the router end of the cable and the modem end of the cable. [again, oversimplification]

Now the two LANs can quite happily have addresses that are in the same range, each LAN will work.

Referring to the router, its two addresses are often chosen out of different  non-overlapping ranges to avoid confusing the human and sometimes the router, but nothing  confined your main LAN will fail to work. And PPPoE, the communication between modem and router, will work regardless, it doesn't care about IPv4 addresses as it has nothing to do with them.

[mrpops2ko]

Like many have said, it is easy to change. I also have the same setup - to change it you just edit the lan figure. http://i.imgur.com/RiJ4axV.png Once you change that you are fine.

[wisspa]

Thank you all for your help.  Have ordered the Huawei HG612 so will set it up when it arrives.