Hello,

 

I have installed Armbian on my Banana M1+ and I have noticed „something“ strange in network communication. The network connector blinked rapidly even though nothing was running so I have installed iftop and found out this:

 

iftop -i eth0 -NP

Ankh-Morpork => a81.sub72.net78.udm.net

Ankh-Morpork:51413 => a81.sub72.net78.udm.net:57855

Ankh-Morpork => ip70-118.245.80.crimea.com

Ankh-Morpork:51413 => ip70-118.245.80.crimea.com:52026

Ankh-Morpork => adsl-225.37.6.247.tellas.gr

Ankh-Morpork => ip5653f1a5.direct-adsl.nl

Ankh-Morpork:51413 => adsl-225.37.6.247.tellas.gr:29932

Ankh-Morpork:51413 => ip5653f1a5.direct-adsl.nl:6881

 

I am wondering, what are these communications on newly installed system?

 

Thank you,

Regards,

Petr Sourek

I would like to know myself even I don't see anything except ntpd related here.

Quick google search for port 51413 indicates that this port is commonly used by Transmission (bittorrent client).

Though I don't see Transmission in default packages list.

Ok, sorry guys my bad...

 

On previous „versions“ of Banana M1+ I had bittorrent client to download Debian DVD so I don’t need to let notebook running and for some reason the Apple Airport Express keeps passing the „torrent“ questions back to the banana even though it has been reinstalled „from scratch“ and torrent client is not available. I guess that there is something on the router side than on the linux side of the image.

 

tcpdump:

2016-02-08 11:32:16.038932 IP (tos 0x0, ttl 50, id 48932, offset 0, flags [none], proto UDP (17), length 170)

    broadband-188-32-209-120.nationalcablenetworks.ru.49001 > Ankh.51413: [udp sum ok] UDP, length 142

2016-02-08 11:32:16.039033 IP (tos 0xc0, ttl 64, id 20961, offset 0, flags [none], proto ICMP (1), length 198)

    Ankh > broadband-188-32-209-120.nationalcablenetworks.ru: ICMP Ankh udp port 51413 unreachable, length 178

        IP (tos 0x0, ttl 50, id 48932, offset 0, flags [none], proto UDP (17), length 170)

    broadband-188-32-209-120.nationalcablenetworks.ru.49001 > Ankh.51413: [udp sum ok] UDP, length 142 

 

 

Once again, my bad, sorry :-(

After router restart everything is back to normal...

 

192.168.1.110:22           => 192.168.1.20:62546

192.168.1.255:32412     => 192.168.1.100:52036

192.168.1.255:32414     => 192.168.1.100:59061

192.168.1.255:17500     => 192.168.1.20:17500

255.255.255.255:17500 => 192.168.1.20:17500

 

Everything I can see there now is valid according to the running services. Bug report has been filled for apple airport.

 

Sorry guys again.

Regards,

petr Sourek

Bug report has been filled for apple airport.

 

Please do the Apple support staff a favour, close the bug report on your own and read through RFC 6886 and https://support.apple.com/kb/PH5103

Yeah, I am dumb :-( I have thought, that NAT is enabled as default option, but it seems it is not. I have enabled it.

 

Thank you for pointing out.

Regards,

petr sourek