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[DanielJuravski]

DLEP discovery message is sent with TTL 255 and discovery is for local LAN only.
Thus radio need to filter all packets with destination address equals to multi-cast discovery address and not pass it to AIR.
Added functionality for radio to filter out discovery packets based on multi cast discovery address.

[jgiovatto]

Is it safe to assume ALL downstream packets are ETH_IP ?
//get ipv4 addr destination of the packet

• std::uint32_t addrV = ((Utils::Ip4Header*) ((Utils::EtherHeader*) v.iov_base + 1))->u32Ipv4dst;

[DanielJuravski]

Added check that packet is IPv4 packet. If packet is IPv4, then we check if packet has dlep multicast address.

[DanielJuravski]

Hello,
I fixed the bug were talking about, and added the check if the packet is an IP packet.
Your feedback can be helpful for me.
Regards.

[jgiovatto]

Hi,
Your approach makes the assumption that the data in the downstream pkt is Ethernet. At this layer the data is considered opaque. The more correct approach would be filter these at the emulator data entry point.

I suspect EMANE::RawTransport would encounter this problem regardless of the IP.TTL and an ip tables rule would help if using the EMANE::Virtual transport.

Are you using an EMANE Transport or something custom?