System information

Troubleshooting TCP/IP 7-135

HSRP: Hosts Cannot Reach Remote Networks

Possible Problem Solution

Default gateway is not

speciﬁed or is incorrectly

speciﬁed on local or

remote hosts

Step 1 Determine whether local and remote hosts have a default gateway

speciﬁcation. Use the following UNIX command:

host% netstat -rn

Check the output of this command for a default gateway speciﬁcation.

Step 2 In a network running HSRP, hosts must use the hot standby IP address as

their default gateway speciﬁcation. Use the show standby privileged exec

command to check the current hot standby IP address.

Step 3 You can change or add a default gateway using the following UNIX

command at the host:

host% route add default

address

where address is the IP address of the default gateway (the router local to

the host). The value 1 indicates that the speciﬁed gateway is one hop

away.

You might need to reboot the host for this change to take effect.

Step 4 It is recommended that you specify a default gateway as part of the boot

process. Specify the IP address of the gateway in the UNIX host ﬁle

/etc/defaultrouter. This ﬁlename might be different on your UNIX

system. If you are working with a PC or a Macintosh, consult the

accompanying documentation to determine how to set the default

gateway.