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From: | Asaf Manasse |
Subject: | [lwip-users] internet over PPP and NAT issue |
Date: | Wed, 21 Jun 2017 10:17:52 +0000 |
LWIP team hallo,
I am trying to establish Access Point product based on Marvell MW302 WiFi MCU, using the SDK provided by Marvell.
Marvell SDK implement IP Stack using LWIP version 1.4.X ( last commit : 88a57dc98d9793d74f8e1c52729b50188d5a0b4f ) , integrated with wifi.
I have established to implement PPPOS over USB to 3G modem.
These 2 network interfaces (PPP and wlan) are bridged using LWIP NAT implementation of Company called RT-Thread
(taken from https://github.com/RT-Thread/rt-thread/tree/master/components/net/lwip_nat , I have a permission from RT-Thread to use there code ).
at this point we have a internet connection to the wifi clients but with connectivity issues:
1. connection is not stable (from test I can may be guess it's unstable upload).
2. WireShark log reveals multiple Duplicated ACK and TCP RST.
3. tcp debug print:
[3236.092616] : -+-+-+-+-+-+-+-+-+-+-+-+-+-+ tcp_input: flags
[3236.096609] : tcp_input: no PCB match found, resetting.
[3236.111094] : tcp_rst: seqno 0 ackno 3423651674.
4. pbuf debug print:
pbuf_header: failed as xxx < yyy (not enough space for new header size)
configurations:
* disabled IP_FORWARD.
* set PPP MRU to be 1020 (USB connection bottlenech)
is there any additional information you need for better understanding of the issue?
Asaf Manasse
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