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Increasing maximum # of IP addresses handed out by proxy server

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Last Modified: 2012-08-11
I'm having trouble with a Ubuntu-based proxy server that's running Squid and DansGuardian.  The server is used for content-filtering a guest wireless network.

The system was set up by a consultant who is no longer available, and I'm trying to troubleshoot an issue.  My Linux skills and my networking skills are fairly basic, to say the least.

Here is the problem: After the server runs for three or four days, new devices are no longer able to connect to the wireless network.  The devices seem unable to get an IP address.  My suspicion is that there is a limit to the number of addresses (maybe 50?) that the server gives out.  

Based on the very sparse documentation that was provided by the networking consultant, I know that routing is turned on by executing this command at boot time:

echo 1 > /proc/sys/net/ipv4/ip_forward

Is there a config file somewhere that I can edit to determine (and then change) the maximum number of IP addresses that the server can hand out?  As I said, I don't have much experience in this area, and I wasn't able to answer the question via running Google searches.

Thanks in advance for any guidance.
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