asuswrt and google chromecast - permanent connections building up to port 8008

[bassplayerchris]

Hi -

I have a google audio chromecast connected to an Asus running Asuswrt, after a few hours I get a number of connections built up between random ports on the asus and port 8008 on the chromecast.

Not managed to wireshark for long enough to catch the initial connection, so have no idea if this is being initiated by the chromecast or asus - suspect the asus as the port always stays the same on the chromecast. If I run lsof, the random ports are all owned by the networkmap process.

 

[RMerlin]

This is normal, this is the networkmap process doing its device scans.

 

[bassplayerchris]

Except it appears that these connections once established never clear down - and seem to gradually increase over time. After one hour I had about 2, After 11 hours I have 14 connections, all long lived.

 

[bassplayerchris]

At 21 (persistent) connections after 24 hours or so.

 

[bassplayerchris]

After a couple of days I'm up to 46 connections - please note that these aren't being cleared down, excerpt from netstat:

tcp 0 0 172.16.10.1:34393 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:51515 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:56422 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:38986 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:48138 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:51453 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:53998 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:45348 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:35118 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:53572 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:55788 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:35530 172.16.10.20:8008 ESTABLISHED
tcp 0 0 172.16.10.1:37850 172.16.10.20:8008 ESTABLISHED
...
...

Port numbers are the same - the connections stay up once established and don't seem to terminate.

 

[RMerlin]

It's possible that this was already fixed upstream, because after a few hours here, there isn't a single open TCP session to my Chromecast. I'm running newer code than what's used in 380.58 however.

 

[bassplayerchris]

Okay thanks - i'll pull down the sources and recompile networkmap and see if I still experience the same issue.