djmanas Posted February 7, 2016 Posted February 7, 2016 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
Igor Posted February 8, 2016 Posted February 8, 2016 I would like to know myself even I don't see anything except ntpd related here.
zador.blood.stained Posted February 8, 2016 Posted February 8, 2016 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. 1
djmanas Posted February 8, 2016 Author Posted February 8, 2016 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 :-( 1
djmanas Posted February 8, 2016 Author Posted February 8, 2016 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
tkaiser Posted February 8, 2016 Posted February 8, 2016 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 1
djmanas Posted February 9, 2016 Author Posted February 9, 2016 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
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