Allied Telesis at-8700xl series switch manual Troubleshooting DHCP IP Addresses

Maintenance and Troubleshooting 81

Troubleshooting DHCP IP Addresses

Your switch is acting as a DHCP client

If your switch is acting as a DHCP client the switch should receive its IP address dynamically. If your switch is not receiving an IP address, check that the domain name and host name are correct.

Your switch is acting as a DHCP server

If your switch is not assigning IP addresses to a host, or hosts, on the subnet perform this procedure:

1.Reboot the host machine, to force it to re-request IP settings.

2.Check the host’s TCP/IP settings.

In Microsoft® Windows™ 95/98, click Settings → Control Panel → Network. Select TCP/IP and click Properties. Click Obtain an IP address automatically.

In Microsoft® Windows™ 2000, click Settings → Control Panel → Network and Dial-up Connections → Local Area Connection → Properties. Select Internet connection (TCP/IP) and click Properties. Click Obtain an IP address automatically.

3.Check that the DHCP server has a large enough range of addresses. To assign a range, enter the command:

CREATE DHCP RANGE

Using Trace Route for IP Traffic

You can use trace route to discover the route that packets pass between two systems running the IP protocol. Trace route sends an initial UDP packets with the Time To Live (TTL) field in the IP header set starting at 1. The TTL field is increased by one for every subsequent packet sent until the destination is reached. Each hop along the path between two systems responds with a TTL exceeded packet and from this the path is determined. For more information about trace route, see the Internet Protocol (IP) chapter in the AT-8700XL Series Software Reference.

To initiate a trace route, enter the command:

TRACE [[IPADDRESS=]ipadd] [MAXTTL=number] [MINTTL=number] [NUMBER=number] [PORT=port-number] [SCREENOUTPUT={YESNO}] [SOURCE=ipadd] [TIMEOUT=number] [TOS=number]

Any parameters not specified use the defaults configured with a previous invocation of the command:

SET TRACE [[IPADDRESS=]ipadd] [MAXTTL=number] [MINTTL=number] [NUMBER=number] [PORT=port-number] [SCREENOUTPUT={YESNO}] [SOURCE=ipadd] [TIMEOUT=number] [TOS=number]

As each response packet is received a message is displayed on the terminal device from which the command was entered and the details are recorded. To display the default configuration and summary information, enter the command:

SHOW TRACE

To halt a trace route that is in progress, enter the command:

STOP TRACE

Software Release 2.6.1 C613-02030-00 REV B