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Cisco 860 Router, /32 Subnet Mask on Interface.

So I having a brain fart right now.

I am getting a ADSL connection and the service provider will be supplying the modem, on the other side there will be a cisco 860 router that we supply. Now on my hand out of information from the service provider, they want me to use an "IP of 209.218.53.242"  & Subnet Mask "of 255.255.255.255". When I enter this information into my fast ethernet interface I am getting the following message "Bad mask /32 for address"

So my question is, how do I actually enter this into the router or is there a work around.
Since I haven't entered in a /32 address into a router before.

Thanks,
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Chuckles_1205
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Chuckles_1205
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ciscoguy69Commented:
What are they having you use for a Default Gateway? This will only give you the one address. The command is ip address 209.218.53.242 255.255.255.255 under the interface.
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ciscoguy69Commented:
I would verify with the ISP as that won't allow a DG in the same subnet.
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Chuckles_1205Author Commented:
The gateway address is 209.218.53.1
and
My fastethernet port is 209.218.53.242
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ciscoguy69Commented:
So I would assume a subnet mask of /24.  Or command wise ip address 209.218.53.242 255.255.255.0 since the DG has to be on the same subnet. I would try the /24 and see. Did you already set the DG?
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Chuckles_1205Author Commented:
I am not actually on site, we are doing the install tomorrow. So I get what your saying, becuase in order for both of them to talk they would have to be on the same subnet and .255 will not achieve this, where a 255.255.255.0 or even a 255.255.255.252 (Modifying the modem address) could achieve this.
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ciscoguy69Commented:
Exactly. In order to get to other subnets, you need to have a DG that you can get to. Then the DG has networks it can get to and so on. the .255 makes that IP the only one so you couldn't have a DG, thus you can not get outside that interface. Good luck with the install.
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Chuckles_1205Author Commented:
Well I thought I would give you an update.

I have everything up and working at the site, I do have a some work with ICMP and SSH connections left to do.

I found out the information was provider to us, was actually the wrong information and was the information for the modem/router they provided us with.


Thanks for the help ciscoguy69!
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Chuckles_1205Author Commented:
Thanks for the help, kind of forgot the basices there.
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