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Virus filtering for non-secured hotel network.

I have a customer, a hotel that has a non-secured wireless network for their guests to use to access the internet.  Currently it's just a Cisco router and a series of wireless access points.  The problem we are having is that guests are showing up with infected laptops and using the internet connection to unknowingly blast out mail viruses in particular.  The ISP is getting annoyed and wants us to do something about it.

I thought about limiting outbound tcp/25 access to the mail servers of the ISP only.  But then most customers probably woudn't be savvy enough to change their outbound mail server and would just experience it as mail not working properly.

Alternatively I know that I could put a Barracuda hardware virus filter box in place and that would do the trick.  But at several thousand dollars that's way more than this customer wants to spend.  Does anyone know if there's a cheap Linksys-style box that would do more or less the same thing?  Basically I just need some in-line solution that will detect virus traffic and kill it, getting the ISP off our backs.

Thanks,

Ben
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cns13
Asked:
cns13
1 Solution
 
DbergertCommented:
if you can setup a linux box, you could transparently redirect port 25 (SMTP) to a Transpart SMTP proxy that performs virus scanning,   such as :

http://smtp-proxy.klolik.org/
http://memberwebs.com/nielsen/software/proxsmtp/transparent.html

Or   Require users to use company VPNs or Webmail....  you could could put this on a stiker on the modem in the hotel or another notice and block SMTP

Or -- install a proxy server, that would filter traffic for viruses ? ? ?

I've used mailscanner.info -- also ...

 
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cns13Author Commented:
Thanks Dbergert,

The Linux solution would be fun.  I tend to use a fair amount of Linux here in my network for remote monitoring of customer networks.

But I'm concerned about the time it would take to set up.  I talked with Sonicwall and they claimed that their gateway antivirus on a little tz170 would work.  That's only about $1000 in hardware and 2-3 hours of my time, so I think that will be the cheapest in the long run.

But I'll give you the points for being the only one to answer!

Ben
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