🚀 go-pugleaf

ins122a@lindblat.cc.monash.edu.au (Mike Battersby) writes:

[about SLIP]

>For me, tcp connections will mysteriously stop trasmitting data. This is
>intermittent with 'telnet' and 'rlogin', and seemingly better (although
>perhaps this is only an illusion) with pl14z and pl15 over pl14x. 'ftp'
>connections, however, will *always* die after transferring <25k of data.
>They do not disconnect, but data ceases to come through (netstat still
>shows 'ESTABLISHED').  This only occurs when sending to the Linux box,
>...

I agree 100%, I was seeing precisely the same symptoms with mtu 1500.
However, with mtu 500 the predictable hang of tcp (for me after 26112 bytes)
has disappeared. Only intermittent (and not very frequent) hangs of
telnet and rlogin remain.

An interesting experiment is to try  ping -s nnnn  and see what happens.
(For me, with mtu 1500: ping -s S hangs after N packets:
	S	N
	485	54
	500	53
	600	45
	700	40
	800	35
	900	32
	1000	29
	1200	24
	1400	20
	1500	20
	1600	19
	3000	10
this shows clearly that the packet size is irrelevant, only the total
number of bytes transferred counts. On the other hand, ping -s 484
runs indefinitely (and the same holds for ping -s S with S < 484).)

Andries