Hello! See the packet info below: rad_recv: Access-Request packet from host 168.2.8.28 port 5001, id=142, length=121 User-Name = "licheng" EAP-Message = 0x0201000c016c696368656e67 Message-Authenticator = 0xb11d9a0d22d86cfb58038fe5832a9f9a NAS-IP-Address = 168.2.8.28 NAS-Identifier = "000fe281c738" NAS-Port = 268517377 NAS-Port-Type = Ethernet Service-Type = Framed-User Framed-Protocol = PPP Calling-Station-Id = "0006-5b28-47aa" Notice the NAS-Port = 268517377. It should represent the ID of the port, from which the packet is sent. But when I look up the MIB info of the switch, I can't find such an ID of the port. Instead, the base port number is another integer. How can I get this number (say 268517377) by SNMP? Thank you! _________________________________________________________________ SkyDrive电子画册，带你领略精彩照片，分享“美”时“美”刻! http://www.windowslive.cn/campaigns/e-magazine/ngmchina/?a=c