My cisco 2621 is running IOS version 12.3(24) with firewall feature set. The router has 64Mb RAM and 16Mb flash.
I have a simple network with F0/0 is connected to my cable modem netowrk and F0/1 is my LAN network. I only have single Windows XP machine on the LAN side. Under normal condition, I can telnet and ssh into the router without any issues. By the way, NO ACL blocking access-list on the router whatsover.
access-list 100 permit ip 192.168.1.0 0.0.0.255 any
ip nat inside source list 100 interface f0/0 overload
ip address dhcp
ip nat outside
ip address 192.168.1.1 255.255.255.0
ip nat inside
Whenever I start the bit-torrent application, I can NO longer telnet into the router. Even when I stop the bit-torrent on my Windows XP machine, I still can not telnet into the router. The only way to telnet to the router is to physically reboot the router. After that, I can telnet to the router. As soon as I enable bit-torrent application, I lost telnet access to the router.
If I replace the router with a cheap $30 vyatta router running on a PC, I have no such issue.
Anyone know why Cisco 2621 can not handle bit-torrent application? Thanks.
I do not believe that the issue is bit-torrent. I believe that it is your address translation. I have seen issues where telnet to the router does not work when there is address translation that uses an extended access list with permit any. I suggest that you rewrite your address translation to use a standard access list. Perhaps something like this:
access-list 1 permit ip 192.168.1.0 0.0.0.255
ip nat inside source list 1 interface f0/0 overload
Give that a try and let me know if the behavior changes.
My ACL is correct. My WindowsXP is 192.168.1.10/24 and the router is 192.168.1.1/24. If the traffic does not have to traverse the interface, NAT does not apply. Furthermore, when bit-torrent is not running, from my windows XP machine, I can ssh to 188.8.131.52 which is an IP address on the Internet. At the same time, I can telnet/ssh into the router from the XP machine via address 192.168.1.1
Not sure how you came to the conclusion that it is a address translation issue.
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