access-list

[aperez2004]

I need to create an access-group where they can only talk to each other and no one else can communicate with it. And before I implemented, I need to make sure it works otherwise I would have to drive a long way to remove the access-list. Also group should not be able to ping the router

1.1.1.1 Ip router,

1.2.1.0

1.3.1.0

1.4.1.0

permit 100 ip 1.2.1.0 0.3.0.252 1.2.1.0 0.3.0.252

ip access-group 100 in

Is there a website that explains on how to calculate the submask?

thanks

[jackyoung]

In most case, I use my brain to calculate the mask. Or check the appendix in some Cisco press that may also include the mask table. There may be such mask calculator, but I never heard it before.

If you really concern on the mask & access-list issue. You may consider to use some IP address plan w/ easier calculation and segmentation.

Hope this helps.

[nabkhan01]

Hi,

Use the following website. I love his calc.

http://jodies.de/ipcalc

thanks

[Hieu Cao]

You can checkout this handy IP Subnet Calc utility..it's very useful from Wildpackets.com

http://www.wildpackets.com/products/free_utilities/ipsubnetcalc/overview

Hieu