land udp attack

I have some entries in my firewall log for attack source is 0.0.0.0 port 623 destination is 0.0.0.0 port 162 under info I have land udp

I can't seem to find anything on land udp can any one shed any light on what it is
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Sid_FAsked:
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masnrockCommented:
http://www.auditmypc.com/freescan/portlist.asp

Look up 623/udp:
asf-rmcp 623/udp aux_bus_shunt # asf remote management and control protocol, aux bus shunt
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Keith AlabasterEnterprise ArchitectCommented:
Ports 161 and 162 are used for snmp traps. This is a method to read data from devices that are running snmp.
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masnrockCommented:
yeah... i forgot to pay more attention to that side of it. :-P

But anyway, it's good you have the port closed. Would've left a potential way to check out printers and stuff on the network.
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Keith AlabasterEnterprise ArchitectCommented:
Thank you :)
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