What do no service udp-small-servers and tcp-small-servers do?
abefroman
Banned Posts: 278
in CCNA & CCENT
What do no service udp-small-servers and no service tcp-small-servers do?
And how do I know when to use them?
TIA
And how do I know when to use them?
TIA
Comments
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ConstantlyLearning
Member Posts: 445
"There are 3 types of people in this world, those who can count and those who can't" -
Met44
Member Posts: 194
TCP and UDP Small Servers - Cisco Systems
For your second question:
They are turned off by default on recent IOS releases, so you would only really have to issue the 'no [tu]dp-small-servers' commands on older releases. It is considered a best practice to leave these off unless you need them (as with any service).
"It is recommended that you do not enable these services unless it is absolutely necessary. These services could be exploited indirectly to gain information about the target system or directly as is the case with the fraggle attack which uses UDP echo."
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Edit: CL beat me!