FQDN

F5 refers to an FQDN as a “wide-ip”, or “wip”. The Wide IP maps a FQDN (fully qualified domain name) to one or more pools of virtual servers. For more information on Wide IPs, please refer to the link below.

More information on Wide IPs

On gtm1.site1 navigate to: DNS ›› GSLB : Wide IPs : Wide IP List

../../../_images/gtm_wideip_list1.png

Create an F5 “wide IP” according to the following table:

Field Value
Name www.example.com
Type A
Alias List www.gslb.example.com
Load-Balancing Decision Log - Pool Selection Checked
Load-Balancing Decision Log - Pool Traversal Checked
Load-Balancing Decision Log - Pool Member Selection Checked
Load-Balancing Decision Log - Pool Member Traversal Checked
Pool www.example.com_pool
../../../_images/gtm_wideip_create1.png

TMSH command to run on only gtm1.site1:

TMSH

tmsh create gtm wideip a www.example.com { pools add { www.example.com_pool } aliases add { www.gslb.example.com } load-balancing-decision-log-verbosity { pool-member-selection pool-member-traversal pool-selection pool-traversal } }

Results

Use the “dig” command to query directly to the GTM to test the configuration. DIG will bypass locally configured DNS servers when specifying an “@203.0.113.8” argument.

From the Jumpbox use “dig” from the CMD prompt. The first command below will query 203.0.113.8 for the A record of www.example.com, then query @203.0.113.8 for www.gslb.example.com.

Note

Your result may differ from below

../../../_images/dns_gslb_site1_widepip_results.png

On gtm1.site1 view statistics

../../../_images/gtm_wideip_statistics_flyout.png

For more details click "View"

../../../_images/gtm_wideip_statistics.png

TMSH

tmsh show gtm wideip A www.example.com detail

../../../_images/gtm_wideip_tmsh-show.png

TMSH

tail -f /var/log/ltm

../../../_images/tail_var_log_ltm.png