In 760dd9d support for the IP Option Router Alert was added. Since not all end devices, or even routers, support¹ Router Alert this may lead to loss of function in some setups.
Hence, we need to add support for disabling, or explicitly enabling, this feature.
¹) They may hard-code IP header lengths to 20 bytes, like mrouted does, on reception.
In 760dd9d support for the IP Option Router Alert was added. Since not all end devices, or even routers, support¹ Router Alert this may lead to loss of function in some setups.
Hence, we need to add support for disabling, or explicitly enabling, this feature.
¹) They may hard-code IP header lengths to 20 bytes, like mrouted does, on reception.