A possible alternative to capturing network traffic is running the
command which should generate the DNS lookup via strace and seeing what
it actually does. For example, from `strace ping -c 1 google.com` I can
see that I'm sending my DNS query to 127.0.1.1 (I'm running a local
instance of dnsmasq) and receiving a response.
socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.1.1")}, 16) = 0
poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
sendto(3, "$\237\1\0\0\1\0\0\0\0\0\0\6google\3com\0\0\1\0\1", 28,
MSG_NOSIGNAL, NULL, 0) = 28
poll([{fd=3, events=POLLIN}], 1, 5000) = 1 ([{fd=3, revents=POLLIN}])
ioctl(3, FIONREAD, [204]) = 0
recvfrom(3,
"$\237\201\200\0\1\0\v\0\0\0\0\6google\3com\0\0\1\0\1\300\f\0\1"...,
1024, 0, {sa_family=AF_INET, sin_port=htons(53),
sin_addr=inet_addr("127.0.1.1")}, [16]) = 204
close(3) = 0
On 03/26/2014 07:58 PM, Kent Perrier wrote:
Or capture the network traffic and look at it with wireshark
On Wed, Mar 26, 2014 at 6:14 PM, Paul Boniol <[email protected]
<mailto:[email protected]>> wrote:
You can do some diagnostics with the dig command.
E.g.
dig @server name
dig name
Paul
On Wed, Mar 26, 2014 at 3:57 PM, Howard White <[email protected]
<mailto:[email protected]>> wrote:
On 03/26/2014 01:24 PM, Steven S. Critchfield wrote:
Have you checked the entries in /etc/nsswitch.conf
nsswitch.conf matches another server of the same release level
upon which nslookup works fine.
--
All the best,
Brian Pitts
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