Help! Trying to assign WAN IP to Cisco 877

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Hi Guys,

I am trying to set up a Cisco 877 router on an ADSL circuit but am having difficulties as I do not know which IP address I am supposed to assign on the outside of the router (WAN IP)

the information I have about the circuit is as follows:

WAN

Correct IP: 135.196.211.200
Mask IP: 255.255.255.248

LAN
IP Range: 212.2.20.80/29
Subnet Mask: 255.255.255.248
Router IP: 212.2.20.81
Usable IPs: 212.2.20.82 - 212.2.20.86


On my old router (an old Zyxel) I used 135.196.211.200 with a 255.255.255.248 mask. no problems !

With the cisco 877 is is not letting me assign the above address for my public IP as it is a network ID and will not work. (The router wont accept it)

any ideas?

thanks
: - )

 

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You have already diagnosed the problem: 135.196.211.200/29 is indeed a network address and cannot be used as a host address. Doesn't matter what your old Zyxel let you do... Cisco routers won't allow that (and the Zyxel shouldn't). You need to assign your router a host address in that range - one that the next-hop router isn't using.

Out of curiosity, why are you using routable IP addresses for your LAN instead of non-routable, RFC 1918 IP addresses?

 

Hmmmm.......very strange stuff, there was a fault on the line anyway which has now been resolved and now ive managed to get the .200 address assigned and working on the WAN interface. PPP is weird !!

No idea regarding the routable IP's, this was just what we were assigned by the ISP for extra range.

Thanks for your advice : - )

 

BTW, you don't need to use your internal interface for the extra address space from your ISP. Just set up the nat rules on the external interface. This can give you more visibilty and control of traffic entering your network.

Spice_Weasel