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When I ping DC1 on a local network using only the hostname, I receive an expected response. However, if I ping a remote DC (DC5 for example) over site-to-site IPsec VPN, I receive the following error:

Ping request could not find host DC5. Please check the name and try again.

If I try to ping the FQDN dc5.mydomain.com, I receive a response.

Why is it that hostnames are working locally, but not over the VPN tunnel?

toolshed
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    It sounds to me like the VPN client doesn't have a DNS suffix. If you run nslookup in interactive mode with debug and query for DC1 while connected to the VPN what does the query look like? – joeqwerty May 02 '16 at 02:48
  • Server: dc1.mydomain.com Address: 172.10.10.100 ------------ Got answer: HEADER: opcode = QUERY, id = 2, rcode = SERVFAIL header flags: response, want recursion, recursion avail. questions = 1, answers = 0, authority records = 0, additional = 0 QUESTIONS: dc5, type = A, class = IN ------------ – toolshed May 02 '16 at 03:03
  • ------------ Got answer: HEADER: opcode = QUERY, id = 3, rcode = SERVFAIL header flags: response, want recursion, recursion avail. questions = 1, answers = 0, authority records = 0, additional = 0 QUESTIONS: dc5, type = AAAA, class = IN ------------ *** dc1.mydomain.com can't find dc5: Server failed – toolshed May 02 '16 at 03:03
  • Its a DNS Suffix problem. Add dns suffix mydomain.com in your computer properties. – BDRSuite May 02 '16 at 09:13

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