Symantec 5 manual Selecting UDP ports, Configuring the netmask for LLT, # setparms ipaddress

160 Advanced VCS installation topics

Using the UDP layer for LLT

Table A-2	Field description for set-addr command in /etc/llttab
Field	Description
node-id	The ID of the cluster node; for example, 0.
link tag-name	The string that LLT uses to identify the link; for example link1,
	link2,....
address	IP address assigned to the link for the peer node.

Selecting UDP ports

When you select a UDP port, select an available 16-bit integer from the range that follows:

■Use available ports in the private range 49152 to 65535

■Do not use the following ports:

■Ports from the range of well-known ports, 0 to 1023

■Ports from the range of registered ports, 1024 to 49151

To check which ports are defined as defaults for a node, examine the file /etc/services. You should also use the netstat command to list the UDP ports currently in use. For example:

# netstat -au more
Active Internet connections (servers and established)
Proto Recv-Q Send-Q			Local Address Foreign Address		State
udp	0	0	*:32768	*:*
udp	0	0	*:956	*:*
udp	0	0	*:tftp	*:*
udp	0	0	*:sunrpc	*:*
udp	0	0	*:ipp	*:*

Look in the UDP section of the output; the UDP ports that are listed under Local Address are already in use. If a port is listed in the /etc/services file, its associated name is displayed rather than the port number in the output.

Configuring the netmask for LLT

For nodes on different subnets, set the netmask so that the nodes can access the subnets in use. Run the following command and answer the prompt to set the netmask:

# set_parms ip_address