AirPrint-Services breaking WLAN in some circumstances

[malexmave]

Hello,

I was trying to use your Script in a way that was probably not intended, but seemed to work just fine:
My University has a CUPS-Server with some printers attached. We can ssh into the university network and tunnel a port to the cups-server to print from home.

I used the following steps:

1. Create an SSH tunnel that links my local port 6631 to the remote port 631 on the CUPS server
2. Add "BrowsePoll localhost:6631" to the /etc/cups/cupsd.conf file, restarted cups
3. Checked that the printers are recognized correctly (they are)
4. Downloaded your Script and ran it with the following parameters:
   -H localhost -P 6631 -u [my_username_on_the_server]
5. The script created the .service-files just fine. I moved them to /etc/avahi/services and restarted the avahi-daemon
6. All WLAN devices lost internet access, trying to connect to the WLAN yielded error messages stating that the device was unable to join the network
7. I removed all AirPrint-*.service-Files from the directory, restarted the avahi-daemon and everything was fine again.

I am using the latest version of avahi that is available on the ubuntu repos. Other version information:
OS: Linux Mint 12 (latest version)
Router: TP-Link TL-WR841N

Devices I have tried to connect:
iPad 3
Laptop with Linux Mint 12
Google Nexus S

A sample .service file the script generated looks like this:

AirPrint r135_hp @ %h_ipp._tcp_universal._sub._ipp._tcp631txtvers=1qtotal=1Transparent=TURF=nonerp=printers/r135_hpnote=r135_hp SW-Laserdrucker in R135 (KogS)product=(GPL Ghostscript)printer-state=3printer-type=0x90d4pdl=application/octet-stream,application/pdf,application/postscript,image/gif,image/jpeg,image/png,image/tiff,text/html,text/plain,application/mozilla-ps,application/netscape-ps,application/vnd.cups-postscript,application/vnd.cups-raw

(no line breaks)

I don't know if this is a bug in Avahi, my Router or your script, but since everything is running fine while I am not using the script, I thought I'll report that bug here first and see what you can make of it.

If you need any more version information, ask.

Sincerely,
Malexmave