Hello,
we are connecting using ppp and serial line to linux and windows computers. While connected to windows there is not problem, but when connected to linux we are getting TCP ERR: Out of range sequence number received
Every time this error ocured there is delay in response from telnet. If we type to telnet application key by key slowly with pause between characters, we are not getting this error, but when we press key and hold it down, the error appears.
Could you adivce us what could be the problem ?
The Flag Sequence 0x7E is used to mark the start and an end of ppp packet. However according to RFC 1662:
Only one Flag Sequence is required between two frames. Two consecutive Flag Sequences constitute an empty frame, which is silently discarded, and not counted as a FCS error.
This means that when ppp packets are transmitted with no delay in between, only ONE Flag Sequence is allowed to mark an end of a previous packet and a start of the next packet.
RL-ARM TCPnet can properly handle 1 or 2 Framing Flags. Maybe you have an older version of RL-ARM where the Flag Character handling has not yet been corrected.
I guess there is nothing wrong with your linux pppd.
Franc