Arch Linux

Convergence

Member

Registered: 2005-07-02

Posts: 377

[solved]cups keeps sending packets to strange address.

I installed PGL for fun, and checked the logs.  The following appeared repeatedly (several times a second)in my logs:

Jan 31 05:22:57 OUT: 192.168.1.2:631        192.168.1.255:631      UDP  || Consiglio Nazionale delle Ricerche | Bogon | anti-p2p activity
Jan 31 05:23:28 OUT: 192.168.1.2:59395      239.255.255.253:427    UDP  || Bogon
Jan 31 05:23:29 OUT: 192.168.1.2:34602      239.255.255.253:427    UDP  || Bogon
Jan 31 05:23:30 OUT: 192.168.1.2:44794      239.255.255.253:427    UDP  || Bogon

At first, I was alarmed.  Why would my computer be dialing out at all?!  Then I looked a bit closer at the address for "consiglio".  I was a little relieved to realize that this was just cups broadcasting to the local network.     The other address I don't understand.  It is listed as "bogon" which is an ip address that supposedly doesn't exist. 

Anyway, I stopped cups, and both of these occurrences stopped.  Why in the heck is my cupsd trying to ping 239.255.255.253:427?

Last edited by Convergence (2012-01-31 14:31:36)

---

It's a very deadly weapon to know what you're doing
---  William Murderface

teekay

Member

Registered: 2011-10-26

Posts: 271

Re: [solved]cups keeps sending packets to strange address.

239.255.255.253 is a SLPv2 multicast address, used for Zeroconf service discovery.
It's not a public address, so no traffic leaves your network.

CUPS uses it to show shared printers on the local network via dnssd. To disable this, replace

BrowseLocalProtocols CUPS dnssd

with

BrowseLocalProtocols CUPS

in /etc/cups/cupsd.conf and restart cups. That should make it "shut up".

Last edited by teekay (2012-01-31 14:35:49)

Convergence

Member

Registered: 2005-07-02

Posts: 377

Re: [solved]cups keeps sending packets to strange address.

Thanks!  I thought that it might be something like that.

---

It's a very deadly weapon to know what you're doing
---  William Murderface