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| can anyone plz tell me what pop3 uses at layer 4? book tells me its udp where people say its tcp. is there any documentation for these kinda questions? any RFCs? | |
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| edmonds_robert 2003-08-10, 9:29 pm |
| Darth is correct. SMTP uses UDP port 25, maybe that's where the confusion is coming in. | |
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| thnx to both of u but recently i found that pop3 uses both tcp and udp at 110. i found it out from www.iana.org. also dns uses tcp and udp at port number 53. i guess networking is meant to be confusing. u can always blame it for ur fault  | |
| darthfeces 2003-08-14, 11:07 am |
| well i was aware that dns uses tcp and udp 53 .... so it can take advantage of both reliable slower (tcp) and unreliable faster(udp) transport.
i suspect pop3 does the same thing though i am not aware of the specific conditions under which it will utilize each.
pop3 listens tcp/110 for connections and may send some replies encapsulated udp.
i guess this is one of those things that we overlook because it works and really aren't going to fully understand unless you really dig into the nuts and bolts. | |
| edmonds_robert 2003-08-14, 4:10 pm |
| Damn, I thought I was going to get through today without learning anything, and you ruined it.  |
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