[RndTbl] Subdomain wildcard in Bind-style DNS editing

[Scott Toderash]

I use wildcard MX in one of my domains

These lines are NOT equivalent:
     IN    MX      5 example.com.
*   IN    MX      5 example.com.

The latter will give you an MX record on host1.example.com but the 
former will say no MX record exists for host1.example.com

My server is PowerDNS not BIND so there's a chance that BIND would read 
this differently.


On 2024-07-24 01:32, Trevor Cordes wrote:
> On 2024-07-23 Hartmut W Sager wrote:
>> Now, in Bind-style DNS, we have valid short notations for full FQDN
>> in the name field (the left side) as follows:
>> 
>> "@" = "mydomain.com."
>> "abc" = "abc.mydomain.com."
>> 
>> So my question is, might the following also be valid?
>> 
>> "*" = "*.mydomain.com."
>> "*.@" = "*.mydomain.com."
> 
> Yes, if your origin is still mydomain.com (which it should be), then *
> means *.mydomain.com.
> 
> Search "wildcard" in bind9 docs
> https://bind9.readthedocs.io/en/v9.18.13/chapter6.html
> 
> *   IN MX 10 external1.example.com.
> 
> They use it in terms of a bastion host and internal views (probably not
> your situation).  But the syntax would be valid regardless.
> 
> I'm not sure about *.@ so I'd just not use it.
> 
> My #1 word of advice is don't forget to increase your serial# by one
> each edit!  LOL (I always forget)
> 
> My question for you(/others) is doesn't
>     IN    MX      5 example.com.
> in effect already mean:
> *   IN    MX      5 example.com.
> ???
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