[ENet-discuss] Problem with sending packets of certain sizes (near MTU)

[Steffen Kolodziej]

Hi!
I'm using enet - which I like a lot - with a basic-like programming 
language called BlitzMax. BlitzMax is somewhat able to interface with 
C/C++-code, but not quite smoothly. I had to write my own wrapper to 
make use of it. Therefore my error may be caused by other factors than 
enet, but I have no idea where else to post it.
Whenever I send (reliable, not checked for unreliable) packets with a 
size of more than 1356 bytes, they don't get to the recipient as well as 
any other packets sent in the same direction after it. Sending packets 
in the other direction still works and the connection is not noted to be 
dead by enet.
Looked like a MTU issue to me, but when i tried to send packets with 
significantly larger sizes (~2500 bytes) they worked perfectly, so 
packet fragmenting seems to work at least partly. Checking the MTU from 
my PC to the server via Ping in the console returned 1492 or 1500 (???) 
- not sure which one is right, but they're both quite a bit larger than 
enet's standard MTU of 1400 or the packet size at which i encountered 
the problem. I tried to change the server's enet's MTU, but it didn't 
help either. I'm not sure if i really changed it, though, because 
accessing the enet host's data fields is quite complicated through BlitzMax.
I guess the problem is caused by my configuration in some way, and not 
by enet, but i have no idea how to debug it and hope for some clues by a 
enet expert.

Thank you for the otherwise great network library.