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espressif / esp-lwip

Fork of lwIP (https://savannah.nongnu.org/projects/lwip/) with ESP-IDF specific patches
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IP_PORTMAP_MAX and IP_NAPT_TIMEOUT_MS_TCP configuration written to kconfig (IDFGH-8507) #48

Closed tswen closed 1 year ago

tswen commented 1 year ago

Hi @david-cermak

When using the sta_ap_nat solution, if the mobile phone is connected to the AP and frequently switches the live room, it will occupy a large amount of portmaps in a short time. However, because the timeout_ms_tcp has 30 minutes, if the free_napt is not in time, the portmaps will be occupied so quickly that the mobile phone cannot access the network.

Can you write the two settings of IP_PORTMAP_MAX (32-255) and IP_NAPT_TIMEOUT_MS_TCP (10min-30min) in Kconfig, so that they can be configured according to different application scenarios.

david-cermak commented 1 year ago

Hi @tswen

It is possible to customize IP_PORTMAP_MAX even without the related Kconfig option. It's defined as

https://github.com/espressif/esp-lwip/blob/c950063f73ae11dd304b672b26aadb8d3c37296d/src/include/lwip/lwip_napt.h#L54-L56

You can set target definition to lwip component, just adding these two lines in you project Makefile (place after project()):

idf_component_get_property(lwip lwip COMPONENT_LIB)
target_compile_definitions(${lwip} PRIVATE "IP_PORTMAP_MAX=128")

On 2.1.2-esp it's possible to update the timeout options, too:

It's already done on the 2.1.2-esp:

https://github.com/espressif/esp-lwip/blob/c950063f73ae11dd304b672b26aadb8d3c37296d/src/include/lwip/lwip_napt.h#L62-L64

That hasn't been forward-ported to 2.1.3-esp for some reason, sorry for that. Will fix.

tswen commented 1 year ago

Ok, thanks for your suggestion!