- Caching: Does the IOS DNS server cache TXT and SRV records? How about negative caching (DNS NCACHE, RFC2308)?
- ANSWER (partial): Yes, it appears that at the very least it supports caching of TXT and SRV records.
- Which provides better DNS behavior for clients – assigning a search list to the client, or having the router act as a forwarder and check the search domains itself? Pros and cons for each?
- ANSWER (partial): It doesn’t appear that IOS actually postpends the search suffixes for some reason. Eventually I will go back and attempt to address this; at the moment I suspect it’s my configuration rather than a Cisco bug, but as easy as it seems to be to hit bugs in IOS code anymore, I won’t completely rule that out.
October 13, 2013
DNS questions for Cisco IOS DNS server
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