[ENet-discuss] Unable to establish connection despite UDP packets flowing fine back and forth

[Lee Salzman]

This is almost always a failure of the client to call
enet_host_service enough for the handshake to actually finish.

On Wed, Oct 25, 2017 at 2:31 PM, Martin Man <mman at martinman.net> wrote:
> Hi guys,
>
> I’m facing a strange issue today, one of my enet clients is unable to
> connect to a (otherwise perfectly working) enet server.
>
> Since it seems to be perfectly reproducible for the moment I took a capture
> and I’m looking at the dump, but I am not familiar with the internals to
> understand what is happening… could you please help me out?
>
> Looks like the client sends a connect, and server replies two connect verify
> packets, yet client does not signal this up and sends another connect, and
> server replies another connect verify, and this go on and on and on until
> the client connect attempt timeouts and enet signals this up … then I try
> after several seconds, and the same sequence happens…
>
> Here is the full dump from Wireshark with hidden IP addresses and port
> numbers, I can send in the full capture if that helps but this is the
> essence, only the 0x82 and 0x83 being exchanged.
>
> Could you please help?
>
> thanks,
> Martin
>
> Client packet 1:
>
> ENet
>     Peer ID: 0x8fff
>     Sent Time: 0xc321
>     Command: 0x82
>     Channel ID: 0xff
>     Reliable Sequence Number: 0x0001
>     Connect: 8fffc32182ff00010000ffff000005780001000000000001...
>     Outgoing Peer ID: 0x0000
>     Incoming Session ID: 0xff
>     Outgoing Session ID: 0xff
>     MTU: 0x00000578
>     Window Size: 0x00010000
>     Channel Count: 0x00000001
>     Incoming Bandwidth: 0x00000000
>     Outgoing Bandwidth: 0x00000000
>     Packet Throttle Interval: 0x00001388
>     Packet Throttle Acceleration: 0x00000002
>     Packet Throttle Deceleration: 0x00000002
>     Connect ID: 0x7642aa94
>     Data: 0x00000000
>
> Server reply 1:
>
> ENet
>     Peer ID: 0x9000
>     Sent Time: 0xc37c
>     Command: 0x83
>     Channel ID: 0xff
>     Reliable Sequence Number: 0x0001
>     Verify Connect: 9000c37c83ff000100c00101000005780001000000000001...
>     Outgoing Peer ID: 0x00c0
>     Incoming Session ID: 0x01
>     Outgoing Session ID: 0x01
>     MTU: 0x00000578
>     Window Size: 0x00010000
>     Channel Count: 0x00000001
>     Incoming Bandwidth: 0x00000000
>     Outgoing Bandwidth: 0x00000000
>     Packet Throttle Interval: 0x00001388
>     Packet Throttle Acceleration: 0x00000002
>     Packet Throttle Deceleration: 0x00000002
>     Connect ID: 0x7642aa94
>
> Server reply 2:
>
> ENet
>     Peer ID: 0x9000
>     Sent Time: 0xc570
>     Command: 0x83
>     Channel ID: 0xff
>     Reliable Sequence Number: 0x0001
>     Verify Connect: 9000c57083ff000100c00101000005780001000000000001...
>     Outgoing Peer ID: 0x00c0
>     Incoming Session ID: 0x01
>     Outgoing Session ID: 0x01
>     MTU: 0x00000578
>     Window Size: 0x00010000
>     Channel Count: 0x00000001
>     Incoming Bandwidth: 0x00000000
>     Outgoing Bandwidth: 0x00000000
>     Packet Throttle Interval: 0x00001388
>     Packet Throttle Acceleration: 0x00000002
>     Packet Throttle Deceleration: 0x00000002
>     Connect ID: 0x7642aa94
>
> Client packet 2:
>
> ENet
>     Peer ID: 0x8fff
>     Sent Time: 0xc709
>     Command: 0x82
>     Channel ID: 0xff
>     Reliable Sequence Number: 0x0001
>     Connect: 8fffc70982ff00010000ffff000005780001000000000001...
>     Outgoing Peer ID: 0x0000
>     Incoming Session ID: 0xff
>     Outgoing Session ID: 0xff
>     MTU: 0x00000578
>     Window Size: 0x00010000
>     Channel Count: 0x00000001
>     Incoming Bandwidth: 0x00000000
>     Outgoing Bandwidth: 0x00000000
>     Packet Throttle Interval: 0x00001388
>     Packet Throttle Acceleration: 0x00000002
>     Packet Throttle Deceleration: 0x00000002
>     Connect ID: 0x7642aa94
>     Data: 0x00000000
>
> Server reply 3:
>
> ENet
>     Peer ID: 0x9000
>     Sent Time: 0xc958
>     Command: 0x83
>     Channel ID: 0xff
>     Reliable Sequence Number: 0x0001
>     Verify Connect: 9000c95883ff000100c00101000005780001000000000001...
>     Outgoing Peer ID: 0x00c0
>     Incoming Session ID: 0x01
>     Outgoing Session ID: 0x01
>     MTU: 0x00000578
>     Window Size: 0x00010000
>     Channel Count: 0x00000001
>     Incoming Bandwidth: 0x00000000
>     Outgoing Bandwidth: 0x00000000
>     Packet Throttle Interval: 0x00001388
>     Packet Throttle Acceleration: 0x00000002
>     Packet Throttle Deceleration: 0x00000002
>     Connect ID: 0x7642aa94
>
>
>
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