Console log flooded with discoveryd errors. How can I make them stop (not just hide them)?

They are 3,500 out of the 4,000 of the latest messages. They are always of the form:

1/5/15 1:07:38.307 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:40.487 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:40.489 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[70] scopeID[11] errno[22] result[-1]
1/5/15 1:07:40.911 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:42.668 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:43.099 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[76] scopeID[11] errno[22] result[-1]
1/5/15 1:07:45.281 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:45.963 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[70] scopeID[11] errno[22] result[-1]
1/5/15 1:07:48.062 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[73] scopeID[11] errno[22] result[-1]
1/5/15 1:07:49.151 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:50.250 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[68] scopeID[11] errno[22] result[-1]
1/5/15 1:07:51.345 PM discoveryd[49]: Basic Sockets Couldn't set IP_BOUND_IF on socket fd[70] scopeID[11] errno[22] result[-1] 

And so on. The output of lsof -d on the file descriptors in the error messages (68, 70, 73) is:

13:12:35 BigG ~ $ sudo lsof -d 70
COMMAND    PID           USER   FD   TYPE             DEVICE SIZE/OFF     NODE NAME
UserEvent   17           root   70r   DIR                1,4     3638 16936208 /private/var/log
Little      39           root   70   PIPE 0xc31978735fec6a0b    16384          
discovery   49 _mdnsresponder   70u  IPv4 0xc3197873535be7db      0t0      UDP *:60078
filecoord  229           root   70r   DIR                1,4      102 17141816 /Applications/Messages.app
cloudd     237         george   70u  unix 0xc319787357d38073      0t0          ->0xc319787357d38393
com.apple 6884         george   70r   CHR               11,0 0t147584      577 /dev/random
Mail      6916         george   70u  unix 0xc319787357d366ab      0t0          ->0xc319787357d54a9b
13:12:54 BigG ~ $ sudo lsof -d 68
COMMAND    PID           USER   FD   TYPE             DEVICE SIZE/OFF     NODE NAME
UserEvent   17           root   68r   DIR                1,4     2278 16936222 /Library
Little      39           root   68   PIPE 0xc31978735fec695b    16384          
discovery   49 _mdnsresponder   68u  IPv6 0xc319787358001583      0t0      UDP *:56376
filecoord  229           root   68r   DIR                1,4      170 18984735 /Users/george/Library/Mobile Documents/com~apple~mail/Data/MailData
Mail      6916         george   68u  IPv4 0xc31978735c27fb4b      0t0      TCP 172.20.10.2:65427->17.172.34.90:imaps (ESTABLISHED)
Google    7531         george   68u   REG                1,4    45056  2751867 /Users/george/Library/Application Support/Google/Chrome/Default/Shortcuts
13:13:01 BigG ~ $ sudo lsof -d 73
COMMAND    PID           USER   FD   TYPE             DEVICE SIZE/OFF     NODE NAME
Little      39           root   73   PIPE 0xc31978735fec72fb    16384          
discovery   49 _mdnsresponder   73u  IPv6 0xc31978735694dfb3      0t0      UDP *:56847
filecoord  229           root   73r   DIR                1,4     1224 18983081 /Users/george/Library/Mobile Documents
Mail      6916         george   73u   REG                1,4      512 19235471 /private/var/folders/hj/3s2lw9xx18zf5gx13b5wkp0c0000gn/T/http://ift.tt/1wdebzj
Google    7531         george   73u   REG                1,4    18432  2752345 /Users/george/Library/Application Support/Google/Chrome/Default/Login Data

This flood does not happen on my home WiFi, but is occurring while using an iPhone (iOS 8.1.2) plugged into the USB port of a MBP (10.10.1).

In the past the file descriptors in the error messages were different, but it was always three different ones.