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permit WHO service

We are using this accesslist.Apply on every vlan.Can anybody tell me that what is WHO?For what we are using?

access-list 101 permit udp 10.48.25.0 0.0.0.255 10.49.21.0 0.0.0.255 eq who

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Re: permit WHO service

who is udp port 513, definition from the web:

(UDP) who UNIX machines will send out regular broadcast to this port giving a list of who is logged in. At the same time, UNIX machines will listen for these broadcasts and compile a database of who is logged onto which machines on the local area network (LAN).

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Community Member

Re: permit WHO service

who is udp port 513, definition from the web:

(UDP) who UNIX machines will send out regular broadcast to this port giving a list of who is logged in. At the same time, UNIX machines will listen for these broadcasts and compile a database of who is logged onto which machines on the local area network (LAN).

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