HP-UX Mobile IPv6 A.01.00 Administrator's Guide

Chapter 6

Configuring HP-UX Mobile IPv6

Configuring Mobile IPv6 Home Agents

At least one router node on the Mobile Node’s home link must be a Home Agent to allow a Mobile Node to

remain reachable while away from it is away the home link. As described in “The Router Advertisement

Daemon: rtradvd” on page 36,, the rtradvd determines if a system is Home Agent—not mip6mod.

The rtradvd and mip6mod must be running on Home Agents. The rtradvd configures mip6mod Mobile Node

prefix lists and handles handling ICMPv6 messages, the only Mobile IPv6 message mip6mod does not handle.

Generally there are no limits to the number of Home Agents you can configure on each home link. The

rtradvd is not required on Correspondent Nodes.

NOTE Use the man rtradvd command to view the rtradvd (1M) manpage.

Use the following steps to configure an HP-UX IPv6 system as a Home Agent:

Step 1. Start the interface using the following command:

ifconfig lan1 inet6 -private up

Step 2. Configure the Home Agent IPv6 global address, for example:

ifconfig lan1:1 inet6 5009:55::230:6eff:fe04:a848 up

Step 3. Use the mip6config tool to configure the parameters in the mip6mod configuration file. Refer to

Chapter 4, “Creating Mobile IPv6 Kernel Module Configuration Files with the mip6config Tool,” on

page 43, for more information.

Step 4. Use the mip6admin tool to start and configure mip6mod with the configuration file. Refer to

“Starting mip6mod: start” on page 65, for more information.

Step 5. Enable (turn on) the AdvHomeAgentFlag and AdvRouterAddress parameters in the rtradvd

configuration file, /etc/rtradvd.conf by default. Enabling the AdvHomeAgentFlag parameter

identifies the system as a Home Agent on the link. Enabling the AdvRouterAddress parameter sets

the R flag in Router Advertisements and sets the Prefix field to include the sending router node’s

address.

Step 6. Start the rtradvd, for example: rtradvd -c [

rtradvd.conf filename

]

NOTE To avoid the Home Agent from dropping Binding Acknowledgment messages while resolving

the link layer address of the default router after receiving Binding Update messages, increase

the ip6_nd_pending_queue_limit parameter (for example, setting the value to 100). The

default setting for this parameter is 5.

Use the following command to set the ip6_nd_pending_queue_limit parameter:

ndd -set /dev/ip6 ip6_nd_pending_queue_limit 100

You can also set the ip6_nd_pending_queue_limit parameter in

/etc/rc.config.d/nddconf. Use the following example, where [n] represents the number of

entries in /etc/rc.config.d/nddconf:

TRANSPORT_NAME[n]=ip6

NDD_NAME[n]=ip6_nd_pending_queue_limit

NDD_VALUE[n]=100