Thank you for your report.
Please can you explain why this is a problem? As far as I can see, it is
expected behaviour, since for security "DNS source port randomization"
is the recommended way to avoid DNS spoofing.
Once you have answered, please change the bug status back to New.
** Changed in: dnsmasq (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1608185
Title:
dnsmasq uses many ports
Status in dnsmasq package in Ubuntu:
Incomplete
Bug description:
The steps required to see that dnsmasq uses many ports are as follows:
1. Open the browser (e.g. Firefox)
2. Quickly open many websites on different tabs (3 websites are enough in
my case)
3. The connection is slow, so it takes some time until it connects to the
websites.
4. Before any connection to the website is made, execute:
sudo netstat -veepa -n -W
and the following ports will appear (some output was omitted for
clarity):
Proto Recv-Q Send-Q Local Address Foreign Address State
User Inode PID/Program name
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN
0 44220 2983/dnsmasq
udp 0 0 0.0.0.0:7562 0.0.0.0:*
65534 47002 2983/dnsmasq
udp 0 0 0.0.0.0:48812 0.0.0.0:*
65534 48565 2983/dnsmasq
udp 0 0 0.0.0.0:20249 0.0.0.0:*
65534 46993 2983/dnsmasq
udp 0 0 0.0.0.0:41013 0.0.0.0:*
65534 46995 2983/dnsmasq
udp 0 0 127.0.1.1:53 0.0.0.0:*
0 44219 2983/dnsmasq
udp 0 0 0.0.0.0:57570 0.0.0.0:*
65534 49297 2983/dnsmasq
udp 0 0 0.0.0.0:20978 0.0.0.0:*
65534 48597 2983/dnsmasq
udp 0 0 0.0.0.0:17104 0.0.0.0:*
65534 48570 2983/dnsmasq
udp 0 0 0.0.0.0:4850 0.0.0.0:*
65534 46986 2983/dnsmasq
udp 0 0 0.0.0.0:62450 0.0.0.0:*
65534 48595 2983/dnsmasq
udp 0 0 0.0.0.0:1067 0.0.0.0:*
65534 46994 2983/dnsmasq
udp 0 0 0.0.0.0:13620 0.0.0.0:*
65534 47618 2983/dnsmasq
udp 0 0 0.0.0.0:9772 0.0.0.0:*
65534 47027 2983/dnsmasq
udp 0 0 0.0.0.0:54956 0.0.0.0:*
65534 48516 2983/dnsmasq
udp 0 0 0.0.0.0:38781 0.0.0.0:*
65534 48555 2983/dnsmasq
udp 0 0 0.0.0.0:30589 0.0.0.0:*
65534 46987 2983/dnsmasq
udp 0 0 0.0.0.0:30917 0.0.0.0:*
65534 47558 2983/dnsmasq
The user 65534 is "nobody", By inspection of /etc/passwd:
nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin
I'm using Dnsmasq version 2.68 on Ubuntu 14.04.
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