# I have some doubts about the A10 GSLB configuration,

**URL:** <https://community.a10networks.com/t/i-have-some-doubts-about-the-a10-gslb-configuration/756>\
**Category:** ADC - Application Delivery\
**Tags:** gslb, a10-thunder, thunder-adc\
**Created:** [November 25, 2022, 7:50am UTC](https://community.a10networks.com/t/i-have-some-doubts-about-the-a10-gslb-configuration/756 "2022-11-25T07:50:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![huzhiqi](https://avatars.discourse-cdn.com/v4/letter/h/ccd318/32.png) [@huzhiqi](https://community.a10networks.com/u/huzhiqi)\
**Post date:** [November 25, 2022, 7:50am UTC](https://community.a10networks.com/t/i-have-some-doubts-about-the-a10-gslb-configuration/756/1 "2022-11-25T07:50:02Z")

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Good day,dear all.  
We encountered some difficulties in configuring GSLB.Some configurations are as follows:

gslb zone [sgss.com.cn](http://sgss.com.cn)&nbsp;  
&nbsp;policy policy-test&nbsp;  
&nbsp;service 80 www&nbsp;  
&nbsp;&nbsp;policy policy-test&nbsp;  
&nbsp;&nbsp;dns-a-record www-ctc static admin-ip 100&nbsp;  
&nbsp;&nbsp;dns-a-record www-ctcv6 static admin-ip 100&nbsp;  
&nbsp;&nbsp;dns-a-record www-cuc static admin-ip 100&nbsp;  
&nbsp;service 80 sso&nbsp;  
&nbsp;&nbsp;policy policy-test&nbsp;  
&nbsp;&nbsp;dns-a-record sso-ctu static admin-ip 100

As you can see,we have bound “www” and “sso” to “[sgss.com.cn](http://sgss.com.cn)”, and they all use service 80.  
&nbsp;The problem is that A10 can parse “[www.sgss.com.cn](https://nam02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.sgss.com.cn%2F&data=05%7C01%7CGSharma%40a10networks.com%7C441bf117cf9b4a9622bc08dace84f87d%7C91d27ab98c5e41d482e83d1bf81fcb2f%7C1%7C0%7C638049368220535744%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=YwWO0%2FJODypauQ2lnLTF47zjQfutv39IGlct%2FwClsek%3D&reserved=0)”, but it can’t parse “[sso.sgss.com.cn](http://sso.sgss.com.cn)”.But after we change the “sso” service to 81, we can resolve the domain name normally.  
Here is my questions:  
1.Is the SSO domain name inaccessible because it uses the same service port as www?  
2.I don’t quite understand the function of the command like “service 80 www”,what does it mean?  
Thanks！

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**Author:** ![mmartinez\_a10networks.com](https://avatars.discourse-cdn.com/v4/letter/m/d07c76/32.png) [@mmartinez\_a10networks.com](https://community.a10networks.com/u/mmartinez_a10networks.com)\
**Post date:** [November 25, 2022, 8:06am UTC](https://community.a10networks.com/t/i-have-some-doubts-about-the-a10-gslb-configuration/756/2 "2022-11-25T08:06:55Z")

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Hello ,  
The status of these services is related to the status of GSLB Service-IP ports you should have defined in the configuration like this:  
gslb service-ip VIP1\_DC1 192.168.11.51&nbsp;  
&nbsp;port 80 tcp&nbsp;  
!  
Then the status of these GSLB Service-IP ports is related to the health monitors attached to them or to the SLB Virtual Server Port from the same configuration like this:  
slb virtual-server VIP1\_DC1 192.168.11.51&nbsp;  
&nbsp;port 80 http&nbsp;  
&nbsp;&nbsp;source-nat auto&nbsp;  
&nbsp;&nbsp;service-group SG1\_DC1&nbsp;  
!  
So basically, for another port to be usable as Service in your GSLB Zone you need to define it as GSLB Service-IP port first.  
Best Regards !