Hi, I'm developing an application with use of an tcp/ip stack, but encountered that the stack hangs due to a broadcast frame sent on the network (see below) by, I think, a netgear router.
Now I'm planning an update of my stack, but need to understand what the frame actually is - e.g. should I simply reject any frame with protocol 0x0000 (the 2 bytes right after <dest><source>)?
In Wireshark, I've enabled all protocols but still it isn't recognized.
Also, I've read https://www.rfc-editor.org/rfc/rfc7042.html ch3 but still not come to an understanding.
RFC 5342
There are two types of protocol identifier parameters that can occur
in Ethernet frames after the initial MAC-48 destination and source
identifiers:
Ethertypes: These are 16-bit identifiers appearing as the initial
two octets after the MAC destination and source (or after a
tag) which, when considered as an unsigned integer, are equal
to or larger than 0x0600.
LSAPs: These are 8-bit protocol identifiers that occur in pairs
immediately after an initial 16-bit (two octet) remaining frame
length, which is in turn after the MAC destination and source
(or after a tag). Such a length must, when considered as an
unsigned integer, be less than 0x5DC or it could be mistaken as
an Ethertype. LSAPs (Link-Layer Subnet Access Points) occur in
pairs where one is intended to indicate the source protocol
handler and one the destination protocol handler; however, use
cases where the two are different have been relatively rare.
Broadcast frame causing my issue:
0000 ff ff ff ff ff ff b0 b9 8a 68 1e ea 00 00 00 06
0010 82 59 19 f0 82 59 65 80 74 78 2e 63 00 00 00 00
0020 00 00 00 00 00 00 00 00 00 00 01 98 00 25 18 30
0030 82 2d a1 e0 01 00 03 00 00 00 00 00 00 00 00 00
0040 00 00 00 00 00 00 00 00 1a 00 00 00 01 00 00 00
0050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0070 00 00 00 00 00 00 00 00 04 00 00 00 00 00 00 00
0080 04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0090 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00c0 00 00 00 00 00 00 00 00 00 00 00 30 00 00 00 00
00d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0100 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
0120 00 00 00 00 00 00 00 00 00 00 00 00 00
