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Webcast-Catalyst9k
New Member

small servers? what are they

i was reading an article on searchnetworking.com and they guy writing the article said to help secure your router to disable small servers for tcp and udp. my question is what are small servers? thanks for your response!

4 REPLIES
Gold

Re: small servers? what are they

They are some simple diagnostic services built into the router. The nature of the services have their roots in UNIX. For TCP, they are echo (echo all received traffic), chargen (generate continuous stream of traffic), discard (accept all input and return nothing) and daytime (return the date and time and disconnect). For UDP, they are the same except there is no UDP version of daytime. See the following URL for more info:

http://www.cisco.com/en/US/products/sw/secursw/ps1018/products_tech_note09186a008017690e.shtml

In a security sense, it is considered a best practice to disable these services. They generally serve no use in modern networks.

New Member

Re: small servers? what are they

thanks for your response. and also that is a good link you sent.

Silver

Re: small servers? what are they

If you are interested in that sort of thing, here are some more resources:

http://www.cisecurity.org/ has a cisco router security benchmark which is pretty cool. Dump you config into text, and run the benchmark on it.

The NSA has some guides on securing IOS as well

http://www.nsa.gov/snac/index.html

New Member

Re: small servers? what are they

thanks for your links. they were very informative.

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