Need to open Port 1723 on 3com 5012 Router

[marketking]

Hi, I need to open port 1723 (TCP PPTP) on a 3com 5012 router for telnet access to server. I was trying to use port-mapping in system-view, but evidently was not listing the application name correctly. Telnet remote client is Ubuntu Linux. A look at existing port-mapping shows open ports are "system-defined". Anyone know what "system-defined" means, and how I can open TCP Port 1723? Thanks.

 

[SYQUEST]

What does the 3Com user guide say? Any Examples?

If it is a real router, then you would typically put the port assignment in the route definition along with the source and destination IP addresses in some format defined by 3Com.

....JIM....

 

[marketking]

I've been pouring over the user guide, config guide, install guide and there is precious little in the way of examples. The closest thing I have found was a listing for port-mapping, which said, [port-mapping] space [application-name] space [port] space [port number]. I entered telnet as the application name and 1723 as the port number, but it wouldn't accept telnet as the application name. The ports that are open according to the [display port-mapping] command are ftp, http, H323, smtp and rtsp, none of which seem to be attached to an acl, and are all listed as "system-defined". It may be simple syntax problem, or I may be in the wrong area altogether. Any ideas would be greatly appreciated. Thanks.

 

[SYQUEST]

I just downloaded the configuration guide from 3Com to have a look-see. The chapter on NAT Configuration is probably the area to research, but in scanning the chapter, it may be that they limit the actual port assignments in their firmware. You want to read the Firewall Configuration chapter. It discusses the ports for application use. By the way, port 23 is the standard port for TELNET.

Lastly, I guess 3Com has been adding features in the firmware updates for that product. So, depending on the version you have installed on your router may determine what you can or cannot do with it.

This was the first time I looked at the programming for a 3Com router, and I must say it is very different from Juniper or Fortinet routers in the concepts used.

....JIM....