# 1----ICMP Internet Control Message
# 2----IGMP Internet Group Management
# 6----TCP Transmission Control
# 8----EGP Exterior Gateway Protocol
# 9----IGP any private interior gateway (used by Cisco for their IGRP)
# 17---UDP User Datagram
# 41---IPv6 Ipv6
# 46---RSVP Reservation Protocol
# 47---GRE General Routing Encapsulation
# 50---ESP
# 51---AH
# 61---any host internal protocol
# 63---any local network
# 68---any distributed file system
# 88---EIGRP EIGRP
# 89---OSPFIGP OSPFIGP
# 99---any private encryption scheme
# 112--VRRP Virtual Router Redundancy Protocol
# 115--L2TP Layer Two Tunneling Protocol
# 135--254 Unassigned
# 255--Reserved
HTTP ---------TCP 80
FTP ------------TCP 20,21
TelNet ---------TCP 23
SMTP ---------TCP 25
DNS -----------TCP/UDP 53
TFTP --------- UDP 69
SNMP -------- TCP 161
RIP ------------ UDP 520
IMAP 4------- TCP 143
IMAP 3 ------- TCP 220
ISAKMP-------UDP 500
RPC ------------ TCP 135
LDAP ---------- TCP 389
WINS ---------- TCP 42
BootP ---------- UDP 67
DHCP ---------- UDP 68
POP2 ----------- TCP 109
POP3 ----------- TCP 110
Net BIOS ------ TCP 139
SSL(HTTPS) ---- TCP 443
SQL Server ---- TCP 1433
NFS -------------- UDP 2049
SSH -------------- TCP 22
BGP -------------- TCP 179
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Important Protocol and Port Numbers
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