Hi there guys.I work for a college. We have a guy that does all our WAN routers etc. My question is the subnet masks he chooses with the routes he adds. We have for example site 1 with a ip range of 10.1.24.0 255.255.255.0 and site 2 with range 10.1.32.0 mask 255.255.255.0 Now at site 3 this was his configaration of the static routes in the D-link layer 3 switch.. 10.1.24.0 255.255.240.0 10.1.15.242 10.1.32.0 255.255.248.0 10.1.15.242 This site has a 10.1.15.0 range as you can see and 10.1.15.242 is the cisco router. Why would the masks change is my question ?? Shouldnt the masks for the 16 range and 32 range stay the same ??? Regards Shaun

The two statements appear to be Routes, not IP address assignments. Thanks.

Yes, those are the routes to get from site 3 to site 1 and site 2, with the next hop being the Cisco. I would imagine the LAN's used on Site 1 and Site 2 correspond to the masks shown on the route statements (i.e. they are not /24s afterall). Cisco 3750 Site

Thanks very much for you response. If I look at the DHCP scopes on the servers local to the sites it is infact for example 10.1.24.0 255.255.255.0 and at the other site 10.1.32.0 255.255.255.0 I would have put this in the D link layer 3 at the 3rd site. Or am i not understanding something. 10.1.24.0 255.255.255.0 10.1.15.242 10.1.32.0 255.255.255.0 10.1.15.242 regards Shaun

I am aware of the fact that there are staic routes and not DHCP scopes. My question is just if the scope at the the remote site is infact 10.1.24.0 255.255.255.0 why would the static route look like this 10.1.24.0 255.255.240.0 10.1.15.242 Shouldnt the mask stay 255.255.255.0

This route is for all networks 10.1.24.x to 10.1.31.x Instead of having multiple routes, only single route is used. Thanks.

Thanks for the reply Rais.. But he hasa all the subnets in the layer 3 not just the one aboove. he has 10.1.24.0 255.255.240.0 10.1.15.242 10.1.32.0 255.255.248.0 10.1.15.242 See the one mask has a 240 and the other a 248 but at the respective sites these scopes are 255.255.255.0 Lol, Im just tryig to understand whats up here :)