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[lwip-devel] [bug #60502] IPCP doesn't handle No Options from DCE
From: |
Barry Andrews |
Subject: |
[lwip-devel] [bug #60502] IPCP doesn't handle No Options from DCE |
Date: |
Sun, 2 May 2021 21:00:42 -0400 (EDT) |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:88.0) Gecko/20100101 Firefox/88.0 |
URL:
<https://savannah.nongnu.org/bugs/?60502>
Summary: IPCP doesn't handle No Options from DCE
Project: lwIP - A Lightweight TCP/IP stack
Submitted by: mrandini
Submitted on: Mon 03 May 2021 01:00:41 AM UTC
Category: PPP
Severity: 3 - Normal
Item Group: Faulty Behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
lwIP version: 2.1.1
_______________________________________________________
Details:
Currently PPP to a cellular modem such as the Cinterion EC21 or Telit LE910
will not work for TCP as responses back from the server will be blocked
because of incorrect PPP negotiation.
This is 100% repeatable. I have attached a PPP hex dump for wireshark to show
the difference in negotiation for the TIRTOS NDK PPP which works reliably
(first session in the capture) and the LWIP negotiation which fails 100% of
the time (Second negotiation).
In the IPCP I have noted that when a DCE has no options to negotiate the LWIP
IPCP stack currently rejects its request to have no options. The TIRTOS stack
ACKs this.
The TIROTS NDK works reliably with a TCP outgoing connection correctly getting
a response back through the mode, the LWIP stack sends out the TCP packet and
it is received by the server, but the response never comes back to the stack
and hence a TCP connection cannot be established.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Mon 03 May 2021 01:00:41 AM UTC Name: _PPP@hex@dump@1.txt Size: 8KiB
By: mrandini
Wireshark format hex dump file, import with timestamp set to %M:%s., direction
included and PPP protocol
<http://savannah.nongnu.org/bugs/download.php?file_id=51363>
_______________________________________________________
Reply to this item at:
<https://savannah.nongnu.org/bugs/?60502>
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- [lwip-devel] [bug #60502] IPCP doesn't handle No Options from DCE,
Barry Andrews <=