Newibe IP question

BenjiSayers

BenjiSayers

BenjiSayers

Soldato
Joined
13 Dec 2006
Posts
3,247
Hi Guys,

A bit embarrassed to ask this as I should really know this given what I used to do but my mind has gone blank but.... Our ISP is making changes to our connection and have provided us with a new set of details on the letter there are two IP's a Fixed IP X.X.X.X and a Routed IP X.X.X.X/29 I know the /29 denotes how many usable IPs there are but which would go in to the router as and what should I do with the t'other.

Thanks in advance you are now free to laugh at my stupidity :o
 
you mean what is the subnet for /29? that would be


255.255.255.248

binary being

11111111.11111111.11111111.1111100 = / 29 (1's)
 
Ah sorry no, I know the subnet.

I wanted to know which of these IPs would be used in the ther router. E.g. when you set the router up and you have a fixed IP you can enter that IP in to the router config. I just got confused as to which I need to use seeing as they have provided two IP albeit named differently.

hope that makes more sense :)
 
When I've done this for ADSL ISPs who give a static + range (rather than just a range), I've let the router pickup the static and used the range on a firewall appliance (if needed)
 
The fixed IP address will be the WAN (DSL) side of the router and the /29 will be on the LAN side of the router, with the router taking 1 of the 6 usable addresses leaving you 5 others for Hosts
 
Syngress said:
The fixed IP address will be the WAN (DSL) side of the router and the /29 will be on the LAN side of the router, with the router taking 1 of the 6 usable addresses leaving you 5 others for Hosts
Click to expand...


This, but check with the ISP - some allow you to use whatever IP on the /29 as the gateway address, and some stipulate it must be the first available (second in the block as the first is the network address) or the last available (second to last in the block as the last is the broadcast address).
 
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