打印机端口转发

转发TCP/IP端口9100

转发SNMP端口161，162（如果启用了SNMP协议）

How Network Printing Works

Service Name                             UDP                 TCP
Services for Macintosh (uses AppleTalk)  201, 202, 204, 206  201, 202, 204, 206
Internet Printing Protocol (uses HTTP)   80                  80
NWLink (uses IPX/SPX)                    213                 213
LPDSVC (accepts LPR)                     515                 515
LPR Port (sends LPR)                     721-731, >1023      721-731, >1023
Server (using SMB)                       137, 138            139
Server (using RPC)                       530                 530
Standard Port Monitor (using SNMP)       161, 162            161, 162
Standard Port Monitor (using LPR)        > 1023              > 1023
Standard Port Monitor (using RAW)        2000, 2501-2503,    2000, 2501, 2503, 
                                         3001, 6869, >=9100  3001, 6869, >=9100