Troubleshooting
- Last Updated: January 10, 2025
- 2 minute read
- LoadMaster
- LoadMaster LTSF
- Documentation
Refer to the following sections for troubleshooting information relating to persistence/stickiness and scheduling.
Persistence/Stickiness
If connecting from a client to the GEO LoadMaster directly the GEO LoadMaster keeps a persistence entry for the request. If connecting from a DNS server to the GEO LoadMaster directly, the GEO LoadMaster keeps a persistence entry for the request as does the DNS server. For troubleshooting, ensure to set stickiness on the GEO LoadMaster to 0 and clear the DNS cache on the DNS server.
To clear the DNS cache on a Windows server, run the following command:
c:\> Dnscmd /clearcacheAlways test with the nslookup command or the dig command directly against the GEO LoadMaster to confirm the results.
Scheduling
Round Robin
This is the same principle as the normal LoadMaster with one exception - when using the nslookup command, by default, it checks for both IPv4 (A) records and IPv6 (AAAA) records, which actually sends out two requests.
If you have two sites:
- Request 1 - IPv4 A round robin to Site 1
- Request 2 - IPv6 AAAA round robin to Site 2
- Request 3 - IPv4 A round robin to Site 1
- Request 4 - IPv6 AAAA round robin to Site 2
When testing, clients looking for IPv4 always connect to Site 1 and clients looking for IPv6 always connect to Site 2. To help prevent this from occurring during testing, you can add an odd number of sites.
nslookup Troubleshooting
nslookup command:
c:\> nslookup <FQDN> <GEO address>For example:
c:\> nslookup geotest.lan 10.113.0.52
Response is:
Name: geotest.lanAddress: 10.10.10.10Commands for further testing:
Changes request type to IPv4 A record:
nslookup –query=AChanges request type to IPv6 AAAA record:
nslookup –query=AAAADIG command:
user@linux: dig <domain>user@linux: dig test.domain.comSearch for an FQDN:
user@linux: dig –t <record type> <FQDN>user@linux: dig –t A test.domain.comSearch for an A record type:
user@linux: dig –t <record type> <FQDN>user@linux: dig –t AAAA test.domain.comSearch for an AAAA record type:
user@linux: dig –t A <DNS server/ GEO> <domain>user@linux: dig –t A @10.113.0.54 test.domain.comSearch for an A record type against this DNS server or GEO (10.113.0.52).