Giving a device an external address

LizardKing · 11 May 2011 at 20:24

Sorry for what seems to be a bit of a n00b question but networking just isn't my thing

I've got a Zyxel Prestige 662HW and 4 ip's of which 2 are usable from my ISP, i need to give a SAP router the 2nd usable IP, only i cant see any easy way of doing this

The SAP router has already been preconfigured to have the 2nd ip and the 1st ip as its gateway, i'm hoping this is possible as otherwise it needs to get sent back to Germany to be reconfigured!

Any help would be great, thanks!

LizardKing · 11 May 2011 at 20:33

Ah, think i've found the answer!

I have P662HW-D1 setup in a similar configuration. The P662 receives a public IP from ISP and the ISP has assigned a /30 subnet (mask = 255.255.255.252) to the LAN. Assume the ISP has given 1.2.3.0/30 as public IP block, therefore we have:
1.2.3.0 - subnet (reserved)
1.2.3.1 - available for P662 or my router
1.2.3.2 - available for P662 or my router
1.2.3.3 - broadcast (reserved)

Therefore I configure the P662 as follows:
- LAN IP is 1.2.3.1 (255.255.255.252)
- NAT/SUA is disabled
- adjust firewall to allow WAN-LAN

And I configure my router as follows:
- WAN IP is 1.2.3.2 (255.255.255.252)
- Gateway is 1.2.3.1

And then everything works.

Handy thing to know, previous routers I've used do all this via a fisher price style gui

Laser402 · 11 May 2011 at 21:03

I would have thought the gateway of the second router would be your ISP. like the first router?

LizardKing · 12 May 2011 at 22:52

Laser402 said:
I would have thought the gateway of the second router would be your ISP. like the first router?

I'm not 100% sure, but my laptop worked as it should using those settings.

I'll find out when the SAP guys come and do there thing!