If you have 10-User License, it supports up to ten concurrent source IP addresses from your internal network to traverse through the PIX 501. The integrated DHCP server supports up to 32 DHCP leases.
So, it is clear from above lines is that if the there are more than 10 people accessing the internet through the PIX 501 firewall will be dropped. To increase no of simultaneous connections I suggest you to buy license. Here you need to take a call, if you feel that 10 or less than that access Internet simultaneously, no need of purchasing licenses.
The best option would be to upgrade your license to 50 users. The only other option would be to reduce your connection timeout to allow the PIX to clear idle connections quicker, but you would still be bound to the 10 ip connections, so your problems will not go away entirely.
You can setup your xlate & connection timeouts to a minimum - doing so will enable efficient use of your licensing as it will clear multiple connections from a single user that are idle more frequently. You might have to buy additional licensing in future if everybody is using multiple external connections.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...