5-13
Cisco Global Site Selector Administration Guide
OL-10410-01
Chapter 5 Configuring Access Lists and Filtering GSS Traffic
Deploying GSS Devices Behind Firewalls
Table 5-2
Inbound Traffic Going Through a Firewall to the GSS
Source Port
(Remote
Device)
Destination
Port
(GSS)
Protocol
Details
*
20–23
TCP
FTP, SSH, and Telnet services
49 or user
configured
*
TCP
Return traffic for
*
53
UDP, TCP GSS DNS server traffic
53
*
UDP
Return traffic of GSS software
reverse lookup, “dnslookup”
queries, and name server
forwarding
80 or user-
configured
*
TCP
Return traffic of TCP and HTTP
keepalives
123
123
UDP
Return traffic of NTP updates
*
161
UDP
SNMP traffic
*
443
TCP
Primary GSSM GUI
1304
1304
UDP
Return traffic of CRA keepalives
1974
1974
UDP
Return traffic of DRP protocol
traffic
*
2000
UDP
Inter-GSS periodic status reporting
*
2001–2005
TCP
Inter-GSS communication
2001-2005
*
TCP
Return traffic of inter-GSS
communication
*
3002–3008
TCP
Inter-GSS communication
3002-3008
*
TCP
Return traffic of inter-GSS
communication
*
5001
TCP
Global sticky mesh protocol traffic