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Port 89?

Posted on 2001-06-26
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Last Modified: 2011-10-03
Can anyone tell me what is this port 89 for? I understand that it is "SU/MIT Telnet Gateway". But what
is it for? What is "SU/MIT"?
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Question by:nkong
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6 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 6229980
This tells you all about ports and port assignments:
http://www.iana.org/assignments/port-numbers

If you're looking for protocol 89, that is OSPF. See RFC 1583.

port 89 is a dedicated services port used as a Telnet Gateway between Mass Institue of Technology (MIT) and ___ University (SU)

Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port".

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Author Comment

by:nkong
ID: 6236878
Sorry for delay.
Actually what I'm worrying is if I open the port 89 at our Firewall. What's the impact and threat to our security. Do you have any info regarding this or any info regarding security issue. I really don't know which port is safe to be opened and which is not. What're the actions that will open the opportunity for hacker to intrude our system?
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LVL 79

Expert Comment

by:lrmoore
ID: 6237929
Unless you have a very specific reason for opening it, why would you even consider it? Why open a port that won't be used?

Keep this port list handy for future reference:

http://www.nethog.com/feeds/niteryder/trojans.htm

And this one:
http://www.robertgraham.com/pubs/firewall-seen.html
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Author Comment

by:nkong
ID: 6243939
To access this site http://technet.oracle.com/support/bboard/discussions.htm, this port has to be allowed for the connection to this URL. That's why we're wondering whether any impact if we do so.
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LVL 79

Accepted Solution

by:
lrmoore earned 150 total points
ID: 6244765
If Oracle is using port 89 for parts of their web, then it can't hurt to setup an explicit rule to allow port 89, but restrict it to only oracle's IP network.
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Author Comment

by:nkong
ID: 6247194
Thanks Irmore
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