Add hplip-gui to Kubunto ISO?

[Steve Riley]

On 2012-08-14 22:17:53 Jonathan Thomas <echidnaman at gmail.com> wrote:
>
> As a datapoint, before installing hplip-gui and using it to configure
> the family wireless Officejet 4500, I was unable to use its scan
> function. Skanlite would not find any scanner before using hplip to
> configure it.
> 
> That being said, I don't know if the "average user" would know to use
> hplip to fix that situation, and might give up earlier when skanlite
> doesn't see it.

Interesting, I've just now been looking at Skanlite for the first time, 
watching the traffic with tcpdump. When you start Skanlite, it sends:

* five probes to your subnet's broadcast address, destination port 8612/udp, 
looking for something related to the Canon BubbleJet protocol

* one probe to network broadcast, destination port 3289, which appears to be 
some Epson protocol

* one probe to network broadcast, destination port 1124, which Google tells me 
has something to do with HP VM management but has a curiously scanner-ish 
payload.

Here's the dump, minus the duplicated payloads from source ports 8610..8613 
that match the one from port 8614:

20:24:24.619140 IP 192.168.0.243.8610 > 192.168.0.255.8612: UDP, length 16
20:24:24.719298 IP 192.168.0.243.8611 > 192.168.0.255.8612: UDP, length 16
20:24:24.819411 IP 192.168.0.243.8612 > 192.168.0.255.8612: UDP, length 16
20:24:24.919633 IP 192.168.0.243.8613 > 192.168.0.255.8612: UDP, length 16
20:24:25.019818 IP 192.168.0.243.8614 > 192.168.0.255.8612: UDP, length 16
        0x0000:  4500 002c 0000 4000 4011 b77e c0a8 00f3  E..,.. at .@..~....
        0x0010:  c0a8 00ff 21a6 21a4 0018 836c 424a 4e50  ....!.!....lBJNP
        0x0020:  0201 0000 0000 0000 0000 0000            ............
20:24:25.629421 IP 192.168.0.243.56630 > 255.255.255.255.3289: UDP, length 15
        0x0000:  4500 002b 0000 4000 4011 7927 c0a8 00f3  E..+.. at .@.y'....
        0x0010:  ffff ffff dd36 0cd9 0017 c1c3 4550 534f  .....6......EPSO
        0x0020:  4e50 00ff 0000 0000 0000 00              NP.........
20:24:26.633263 IP 192.168.0.243.35249 > 255.255.255.255.1124: UDP, length 37
        0x0000:  4500 0041 0000 4000 4011 7911 c0a8 00f3  E..A.. at .@.y.....
        0x0010:  ffff ffff 89b1 0464 002d c1d9 0200 0102  .......d.-......
        0x0020:  0000 001d 2500 1673 7464 2d73 6361 6e2d  ....%..std-scan-
        0x0030:  6469 7363 6f76 6572 792d 616c 6c02 0001  discovery-all...
        0x0040:  00

I wonder if running hplip-gui enabled some function on your scanner to respond 
to one of these probe packets? What do you see if you portscan your scanner?

...Steve