[Dnsmasq-discuss] Failed to lookup names randomly
Wang Jian
larkwang at gmail.com
Thu May 8 12:47:21 UTC 2014
As I said earlier, I have a dnsmasq setup in a 150 clients environment. We
are running debian package 2.70-1 built from git.
These few days, we frequently have name lookup failure. I have no
conclusion by now, but I suspect cache code is involved.
A log segment
<colleague A in my team visit this site in browser>
May 8 18:51:30 dnsmasq[22631]: query[A] www.iciba.com from 10.2.3.102
May 8 18:51:30 dnsmasq[22631]: forwarded www.iciba.com to 114.114.114.114
May 8 18:51:30 dnsmasq[22631]: query[A] goto.www.iciba.com from 10.2.3.102
May 8 18:51:30 dnsmasq[22631]: forwarded goto.www.iciba.com to
114.114.114.114
May 8 18:51:30 dnsmasq[22631]: reply www.iciba.com is 58.68.226.32
May 8 18:51:30 dnsmasq[22631]: reply goto.www.iciba.com is <CNAME>
< browser failed to load the page, dns query failed >
<colleague B in my team visit this site by click url provided by A>
May 8 18:52:23 dnsmasq[22631]: query[A] www.iciba.com from 10.2.1.194
May 8 18:52:23 dnsmasq[22631]: forwarded www.iciba.com to 114.114.114.114
May 8 18:52:23 dnsmasq[22631]: reply www.iciba.com is 58.68.226.32
<colleague A tried again>
May 8 18:52:39 dnsmasq[22631]: query[A] www.iciba.com from 10.2.3.102
May 8 18:52:39 dnsmasq[22631]: forwarded www.iciba.com to 114.114.114.114
May 8 18:52:39 dnsmasq[22631]: reply www.iciba.com is 58.68.226.32
<this time page load successfully>
May 8 18:53:03 dnsmasq[22631]: query[A] goto.www.iciba.com from 10.2.3.102
May 8 18:53:03 dnsmasq[22631]: forwarded goto.www.iciba.com to
114.114.114.114
May 8 18:53:03 dnsmasq[22631]: reply goto.www.iciba.com is <CNAME>
<the following is I test from the router itself, by running 'host' and
'dig'>
May 8 19:59:00 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:00 dnsmasq[22631]: forwarded www.iciba.com to 114.114.114.114
May 8 19:59:00 dnsmasq[22631]: reply www.iciba.com is 58.68.226.32
May 8 19:59:04 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:04 dnsmasq[22631]: forwarded www.iciba.com to 114.114.114.114
May 8 19:59:04 dnsmasq[22631]: reply www.iciba.com is 58.68.226.32
May 8 19:59:06 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:06 dnsmasq[22631]: cached www.iciba.com is 58.68.226.32
May 8 19:59:08 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:08 dnsmasq[22631]: cached www.iciba.com is 58.68.226.32
May 8 19:59:12 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:12 dnsmasq[22631]: cached www.iciba.com is 58.68.226.32
May 8 19:59:13 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:13 dnsmasq[22631]: cached www.iciba.com is 58.68.226.32
May 8 19:59:15 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 19:59:15 dnsmasq[22631]: cached www.iciba.com is 58.68.226.32
May 8 20:00:22 dnsmasq[22631]: query[A] www.iciba.com from 10.2.0.1
May 8 20:00:22 dnsmasq[22631]: forwarded www.iciba.com to 114.114.114.114
May 8 20:00:22 dnsmasq[22631]: reply www.iciba.com is 58.68.226.32
The last 8 'dig' return (look at the TTL)
www.iciba.com. 557 IN A 58.68.226.32
www.iciba.com. 552 IN A 58.68.226.32
www.iciba.com. 550 IN A 58.68.226.32
www.iciba.com. 548 IN A 58.68.226.32
www.iciba.com. 544 IN A 58.68.226.32
www.iciba.com. 543 IN A 58.68.226.32
www.iciba.com. 541 IN A 58.68.226.32
www.iciba.com. 475 IN A 58.68.226.32
The following is earlier log I lookup a name from the router when given a
unresolvable name.
root at b10gw:~# host en.cppreference.com
Host en.cppreference.com not found: 2(SERVFAIL)
root at b10gw:~# host en.cppreference.com
Host en.cppreference.com not found: 2(SERVFAIL)
root at b10gw:~# host en.cppreference.com 8.8.8.8
Using domain server:
Name: 8.8.8.8
Address: 8.8.8.8#53
Aliases:
en.cppreference.com has address 74.114.88.128
root at b10gw:~# host en.cppreference.com
Host en.cppreference.com not found: 2(SERVFAIL)
root at b10gw:~# host en.cppreference.com
en.cppreference.com has address 74.114.88.128
root at b10gw:~# host en.cppreference.com
en.cppreference.com has address 74.114.88.128
root at b10gw:~# host en.cppreference.com
en.cppreference.com has address 74.114.88.128
root at b10gw:~# host en.cppreference.com
en.cppreference.com has address 74.114.88.128
root at b10gw:~# host en.cppreference.com
en.cppreference.com has address 74.114.88.128
root at b10gw:~# host en.cppreference.com
en.cppreference.com has address 74.114.88.128
May 8 17:49:15 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:15 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:15 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:15 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:15 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:15 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:17 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:17 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:17 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:17 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:17 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:17 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:24 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:24 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:24 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:24 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:24 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:24 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:26 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:26 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:26 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:26 dnsmasq[17390]: query[AAAA] en.cppreference.com from
10.2.0.1
May 8 17:49:26 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:26 dnsmasq[17390]: reply en.cppreference.com is NODATA-IPv6
May 8 17:49:26 dnsmasq[17390]: query[MX] en.cppreference.com from 10.2.0.1
May 8 17:49:26 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:27 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:27 dnsmasq[17390]: cached en.cppreference.com is 74.114.88.128
May 8 17:49:27 dnsmasq[17390]: query[AAAA] en.cppreference.com from
10.2.0.1
May 8 17:49:27 dnsmasq[17390]: cached en.cppreference.com is NODATA-IPv6
May 8 17:49:27 dnsmasq[17390]: query[MX] en.cppreference.com from 10.2.0.1
May 8 17:49:27 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:32 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:32 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:32 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:32 dnsmasq[17390]: query[AAAA] en.cppreference.com from
10.2.0.1
May 8 17:49:32 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:32 dnsmasq[17390]: reply en.cppreference.com is NODATA-IPv6
May 8 17:49:32 dnsmasq[17390]: query[MX] en.cppreference.com from 10.2.0.1
May 8 17:49:32 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:33 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.0.1
May 8 17:49:33 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:33 dnsmasq[17390]: reply en.cppreference.com is 74.114.88.128
May 8 17:49:33 dnsmasq[17390]: query[AAAA] en.cppreference.com from
10.2.0.1
May 8 17:49:33 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:33 dnsmasq[17390]: reply en.cppreference.com is NODATA-IPv6
May 8 17:49:33 dnsmasq[17390]: query[MX] en.cppreference.com from 10.2.0.1
May 8 17:49:33 dnsmasq[17390]: forwarded en.cppreference.com to
114.114.114.114
May 8 17:49:33 dnsmasq[17390]: query[A] en.cppreference.com from 10.2.1.194
May 8 17:49:33 dnsmasq[17390]: cached en.cppreference.com is 74.114.88.128
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