[riot-notifications] [RIOT-OS/RIOT] esp8266: esp_wifi netdev driver (#10792)

Gunar Schorcht notifications at github.com
Mon Jan 21 14:54:04 CET 2019

@smlng @MichelRottleuthner Concerning the different MTU sizes you have seen. The MTU used by ESP8266, your iMac or a Linux box depends on whether the IPv6 MTU option is provided with the Router Advertisement. Although the MTU for an Ethernet (including WiFi) interface is 1500, once the node/machine received a Router Advertisement with the IPv6 MTU option, it is set accordingly.

You should be able to observe after a reset of the ESP8266 node that `ifconfig` gives a MTU of 1500 as long as it has only a link local address. Once ESP8266 received the routing prefix and determined its global unicast address, the MTU is sized down to the value provided with the Router Advertisment.

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