2.2 : bug when starting of vpcs stopped with "quit"

[Raizo62]

Hi

I put on GNS3 a VPCS

I start the VPCS

On the VPCS, i use the command quit

GNS3 shows that the VPCS is stopped (red button)

But, if i start again this VPCS, GNS3 shows an error :

2020-12-12 10:55:42 ERROR node.py:237 error while starting PC1: Could not start VPCS /usr/bin/vpcs: [Errno 98] error while attempting to bind on address ('0.0.0.0', 5000): address already in use

2020-12-12 10:55:42 CRITICAL __init__.py:1637 Could not start VPCS /usr/bin/vpcs: [Errno 98] error while attempting to bind on address ('0.0.0.0', 5000): address already in use

[grossmj]

I think this is because VPCS hasn't set the port to be immediately reusable (SO_REUSEADDR)

https://hea-www.harvard.edu/~fine/Tech/addrinuse.html

Please can you use the quit command again but this time wait 5 minutes before restarting VPCS. This will validate the root of the issue. Thanks!

[Raizo62]

I think this is because VPCS hasn't set the port to be immediately reusable (SO_REUSEADDR)

https://hea-www.harvard.edu/~fine/Tech/addrinuse.html

I think this link does not recommend to use SO_REUSEADDR

Please can you use the quit command again but this time wait 5 minutes before restarting VPCS. This will validate the root of the issue. Thanks!

I have tested (with 9 minutes) and i have now this error :

=> error while starting PC1: Error while sending command 'bridge create VPCS-21f94403-a183-4a11-98b9-d1660b4786d6': bridge 'VPCS-21f94403-a183-4a11-98b9-d1660b4786d6' already exist: uBridge version 0.9.19 running with libpcap version 1.10.0 (with TPACKET_V3)
Hypervisor TCP control server started (IP 127.0.0.1 port 33313).
UDP tunnel connecting from local port 10003 to IPv4 address 127.0.0.1 on port 10002
UDP tunnel connecting from local port 10000 to IPv4 address 127.0.0.1 on port 10001
Source NIO listener thread for VPCS-21f94403-a183-4a11-98b9-d1660b4786d6 has started
Destination NIO listener thread for VPCS-21f94403-a183-4a11-98b9-d1660b4786d6 has started

Error while sending command 'bridge create VPCS-21f94403-a183-4a11-98b9-d1660b4786d6': bridge 'VPCS-21f94403-a183-4a11-98b9-d1660b4786d6' already exist: uBridge version 0.9.19 running with libpcap version 1.10.0 (with TPACKET_V3)
Hypervisor TCP control server started (IP 127.0.0.1 port 33313).
UDP tunnel connecting from local port 10003 to IPv4 address 127.0.0.1 on port 10002
UDP tunnel connecting from local port 10000 to IPv4 address 127.0.0.1 on port 10001
Source NIO listener thread for VPCS-21f94403-a183-4a11-98b9-d1660b4786d6 has started
Destination NIO listener thread for VPCS-21f94403-a183-4a11-98b9-d1660b4786d6 has started

[grossmj]

Ok, looks like the problem is with uBridge which is not shutdown when vpcs is stopped.

[grossmj]

Fixed.