All of our PC’s in the house are using skype and that has apparently caused some bottleneck issues on the network. I noted an extreme slow starup time when launching the first browser window. It was just like I would have to wait for some kind of timeout in the network, before I had any success at all.
By some kind of luck, I found an advice on the network that I should increase the IP NAT Session table in the firewall. And that fixes the problem everytime:
Telnet <your internal gateway-address>
Type in your password
Select 24 for system maintenance in the menu
Select 8 for command interpreter mode
enter “IP NAT SESSSION 1024”
that takes care of the issue.
Make this change permanent
This fix will not work forever – after a while everything seems to halt again and repeating the steps above will sort the problem again. But it may be done in a permanent way by storing the new table size as a configuration setting.
In command interpreter mode, type:
Here is how my output is listed:
fw10> sys view autoexec.net ip nat loopback on bridge mode 1 sys errctl 0 sys trcl level 5 ip nat session 100 sys trcl type 1180 sys trcp cr 96 128 sys trcl sw off ip tcp mss 1400 ip tcp limit 2 ip tcp irtt 65000 ip tcp window 16 ip tcp ceiling 6000 ip rip activate ip rip merge on ip icmp disc enif0 off ppp ipcp com off sys wd sw on sys wd cnt 600 sys mbuf debug off fw10>
Now, to change all that, the command apparently is sys edit autoexec.net. The thing is, if you are not already familiar with the sys edit command, you will probably need a few hints. Here is what I have done:
1. type sys edit autoexec.net
2. Then continue to type n until seeing the line ip nat session 100
3. Type r and hit return, follwed by the new text ip nat session 1024
4. Enter by hitting return and then save this session by typing x
5. Confirm everything by typing sys view autoexec.net
This worked for me.