Installation guide

Packet filtering 30-15
Chapter 30: Understanding Wave Data Networking
Wave Global Administrator Guide
The list of desired services could also include the ICMP protocol, which allows ping and
TRACERT to work. For simplicity, you can specify just the ICMP protocol and leave the type
and code fields blank, which will allow all ICMP through. However, you could only allow
ICMP type 8 (echo request) to be output and both ICMP type 0 (echo reply) and type 11 (time
exceeded) to be input; this would allow you to ping the Internet, but no one on the Internet could
ping you. A list of ICMP message types is supplied in the following table.
NNTP 119 Network News Transfer Protocol
POP3 110 Post Office Protocol, Version 3
PPTP 1723 Point-to-Point Tunneling Protocol (See “PPTP filtering” on page 30-16 for
additional information)
Remote
Desktop
3389 Remote Desktop
SMTP 25 Simple Mail Transfer Protocol
Telnet 23 Telnet
ICMP message types
Type Description
0Echo reply
3 Destination unavailable
4 Source quench
5 Redirect
8 Echo request
9 Router advertisement
10 Router solicitation
11 Time exceeded
12 Parameter problem
Common ports for TCP and UDP
Service Port Full Name
Release 2.0
September 2010