Question : Cisco 837 Nat table limit

Emule runs in my lan. So, after a while, I have to manually clear nat table because I cant browse anymore.
( clear ip nat translation * )

1/ What size is the nat table on the cisco 837?

2/ What command to tell the router to automatically clear the nat  table when it is full?

thanks

Answer : Cisco 837 Nat table limit

1.  If using PAT which I assume you are, up to 65,535 entries can be used but this will consume about 10MB of memory on the router so you'll probably run out of memory before you hit the limit of NAT table entries or bring your router's processor to its knees.  Router resources are a more practical limit on the number of entries you can have in the NAT table.  Next time you can't browse anymore, use the command "show ip nat statistics" to see how many active translations are in use.  Also do a "show proc cpu" and "show proc memory" to view the current CPU and memory usage at the time of the issue.

2.  You shouldn't have to, the NAT entries should timeout automatically by default.  You can change the default timeouts if desired by using the command:

ip nat translation {timeout | udp-timeout | dns-timeout | tcp-timeout | finrst-timeout | icmp-timeout | syn-timeout | port-timeout{tcp | udp}} seconds