Cisco Cisco Expressway

Appendix 1: Troubleshooting

Wireshark

TCPDUMP traces taken on Expressway or in the network through which Expressway’s DNS requests traverse provide a
good mechanism for seeing the DNS (ENUM) request and the relevant response.

Dig

Dig is a command that allows the DNS server to be interrogated to check its configuration. Use this command from a
Linux system, or download dig for Windows and run that.

Dig of a Specific Entry

dig -t NAPTR 1.2.1.7.5.5.enum.search.com.

Should result in a response like this:

; <<>> DiG 9.4.1 <<>> -t NAPTR 1.2.1.7.5.5.enum.search.com.

;; global options: printcmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 61653

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; QUESTION SECTION:

;1.2.1.7.5.5.enum.search.com. IN NAPTR

;; ANSWER SECTION:

1.2.1.7.5.5.enum.search.com. 15 IN NAPTR 10 100 "u" "E2U+sip" "!^.*$!mary.jones@example.com!" .

;; AUTHORITY SECTION:

enum.search.com. 15 IN NS <Authoritative DNS Server domain>.

;; ADDITIONAL SECTION:

<Authoritative DNS Server domain>.3600 IN A<Authoritative DNS Server IPv4 address>

<Authoritative DNS Server domain>.3600 IN AAAA<Authoritative DNS Server IPv6 address>

;; Query time: 1 msec

;; SERVER: <Local DNS Server IP address>#53(<Local DNS Server IP address>)

;; WHEN: Mon Oct 6 16:17:33 2008

;; MSG SIZE rcvd: 182

Cisco Expressway ENUM Dialing Deployment Guide