Serial over IP

Answered Question
Feb 17th, 2009


Having 2 windows computers with hyperterminal (in real life i have 2 non ip devices with rs232, 19200 bps, flow control: none, stop bits 1. For the purpose of test i'll use hyperterm) and 2 cisco routers 2811. Each workstation terminates a serial cable in one 2811.

Can someone recommend a technology to make the 2 hyperterminals talk serially over IP.

I was looking for other ideas apart from SLIP . I think it's possible to encapsulate that into PPP as well, but can't find much documentation.

Basically i'm looking for documentation on a technology that would transparently encapsulate this serial conversation over IP.

I have this problem too.
0 votes
Correct Answer by Paolo Bevilacqua about 7 years 8 months ago

Hi, this is asynch transport and is done routinely with cisco routers. See:

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Overall Rating: 5 (2 ratings)
Giuseppe Larosa Tue, 02/17/2009 - 23:03

Hello Claudiu,

I would consider L2tPv3 and DLSW+.

for L2tpv3

for DLSW+

but I have doubts they can support Rs-232: L2tp3 can transport PPP frames.

I tried to search and I've found some third party devices

ESP-2 MI Serial Hub

or SW based see

using a PC

I remember another thread mentioning a standard for this kind of transport.

Hope to help


Giuseppe Larosa Wed, 02/18/2009 - 00:06

Hello Paolo,

I didn't know this feature it is the right tool for his needs

Best Regards


c.captari Wed, 02/18/2009 - 01:06

Hi. Thanks for the sugestion

Indeed this seems to do the job.

With the only drawback that is unreliable being on top of UDP. I would have prefered a TCP solution.


Paolo Bevilacqua Wed, 02/18/2009 - 01:12

You can do it over tcp too. Just have a telnet autocommand to the "raw port", that is 2000 + line number. Basically one router is active, the other waits for the connection.

People used that for years before the feature I posted the link about.


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