to do this i would have to set the outside int of the asa as DHCP?
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Cisco ASA5505 on Public /32 Subnet???
Hello Gents, i'm having a customer setup a wireless CDMA modem on a remote location.
The modem has "router mode" as well as "IP Passtrough mode", so i thought, simple, just get the public ip of the modem and assing it to the outside int, however when i call the service provider they tell me the public ip has a /32 subnet mask and thus no gateway?
When i try to configure my outside int as a ip: x.x.x.x 255.255.255.255 i get "BAD MASK"
can i do this? should i do this? help!
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Answers
Judging from the device description, you would use the IP Passthough mode and then turn on DHCP for the outside interface of the ASA. Odds are the device will get a different IP each time it would conenct if it ever disconnects and also it acts like a simple device on their network, odd it doesn't have a gateway though, you should definately have one once the pass through hands the IP to the ASA.
well, i think it doesnt have a gtwy because /32 is used for point to point connections,
im thinking of setting up the outside int on the asa as a private on the LAN side of the ISP Modem and setting up my LAN ip as a DMZ on the modem. any comments? would i be able to use the cisco VPN client pinted at the WAN ip of the modem?
Cisco VPN client -----> public on the Modem -----> Modem Lan ------> Private on the ASA
Comments?
A slash 32 doesn't exist as a network, its a single host, there is only one IP, it would have to be a slash 30 wich gives it two addresses that are usable. For now if its a static IP and you do pass through what if you put it on a PC and let the PC use DHCP does it have a gateway then? That may give you more information as to what is being handed out. The subnet mask for that is 255.255.255.252. If you could please post a screen shot of the Windows Box geting DHCP if it does. The problem with not having a gateway is that traffic can never leave that network because that is how IP routes traffic to different networks.
Thanks for the comments, It is not a PC getting the IP it's a cisco box, and the modem is at a remote locaiton so i cannot hookup a pc even if i wanted to...
For the earlier comments: It's a /32 so = 255.255.255.255 not .252
i dont know how it works but based on what ive read online its pretty common for ISP's to do this.
I've settled with putting the outside int of the asa on the LAN side of the modem/router and seeting it as a DMZ, let's see what happens.
Thanks,
The DMZ solution sounds like the only option then, if you can get into the CDMA Modem and do a 1:1 NAT so everything goes to the ASA from there. Now DMZ is getting tossed arond a lot and losing some context for me. I would assign the external Int on the ASA with an address then use rotuer mode on the CDMA device and forward everything to the ASA this way you can still keep some of hte security intact. I assume this what you are going to do and Use the NameIf DMZ on the ASA.
Yup... i've already shipped the ASA configured to sit on the LAN side of the CDMA modem/router, i have remote acces to the CDMA modem, so, hopefully i'll be able to set the DMZ from here... i tested it with an old dlink i had sitting around and it works. i have my fingers crossed...
i will be on a plane to Canada if it doesnt :).
i found the answer to the /32 question on another thread of this forum.
Thanks a lot guys.
Till next time.
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by: clonga13Posted on 2009-09-08 at 10:06:52ID: 25283916
If you configure the modem as a bridge then you should be able to get the modem's end of the /32 address as the outside address of the ASA. You would use the 255.255.255.252 subnet mask.