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lwip: make IPV6 link-local support over PPP configurable

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Make the link local negotiation for IPV6 in PPP optional and
configurable.
This is because some modems do not support the IPV6 negotiation and
sending IPV6CP frames would in some cases break the network
configuration phase, resulting in a timeout during the Phase Network.

Please note that this does not disable the IPV6 support for the outgoing
communication (IPV6 is still enabled even if this option is not
selected) but just for the local link between lwIP and modem.

Signed-off-by: Francesco Giancane <francesco.giancane@accenture.com>

Merges https://github.com/espressif/esp-idf/pull/4782
Closes https://github.com/espressif/esp-idf/issues/1065
This commit is contained in:
Francesco Giancane
2020-02-17 12:33:37 +01:00
committed by bot
parent 1e95cf3111
commit 872272e23a
2 changed files with 19 additions and 0 deletions
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8
components/lwip/port/esp32/include/lwipopts.h
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@@ -611,6 +611,14 @@
#if PPP_SUPPORT
/**
* PPP_IPV6_SUPPORT == 1: Enable IPV6 support for local link
* between modem and lwIP stack.
* Some modems do not support IPV6 addressing in local link and
* the only option available is to disable IPV6 address negotiation.
*/
#define PPP_IPV6_SUPPORT CONFIG_LWIP_PPP_ENABLE_IPV6
/**
* PPP_NOTIFY_PHASE==1: Support PPP notify phase.
*/