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Barracuda Link Balancer

Can I Add the '@' as an Alias in a CNAME Record on my Barracuda Link Balancer?

  • Type: Knowledgebase
  • Date changed: 8 months ago

Solution #00005481


Scope:

All Barracuda Link Balancer models, firmware version 2.1 and above.


Answer:

Per RFC: 1034:

You can't have a CNAME at the same point as other DNS records. 


"Section 3.6.2 of RFC 1034:


A CNAME RR identifies its owner name as an alias, and specifies the corresponding canonical name in the RDATA section of the RR (Resource Record).  If a CNAME RR is present at a node, no other data should be present; this ensures that the data for a canonical name and its aliases cannot be different.  This rule also insures that a cached CNAME can be used without checking with an authoritative server for other RR types."


Example of What is NOT Allowed in a Zone File:
States zzz.com resolves to the 'A Record IP 74.76.78.254 ' used by abc.com and '@' A record '84.86.88.254'.

DNS Server A zone file -  zzz.com
@       10      IN CNAME       abc.com.
@       10      IN A           84.86.88.254

DNS Server B: zone file -  abc.com
abc.com.     1630    IN  A       74.76.78.254

Example of What IS Allowed in a Zone File:
States bob.zzz.com can be found at 'abc.com's 'A Record IP 74.76.78.254' and 'zzz.com' resolves to '@' A Record 84.86.88.254

DNS Server A zone file -  zzz.com
bob     10      IN CNAME       abc.com.
@       10      IN A           84.86.88.254

DNS Server B: zone file -  abc.com
abc.com.      1630    IN  A       74.76.78.254

Link to this page:
https://campus.barracuda.com/solution/50160000000IQlOAAW