tcp retransmission wireshark stun protocol

The way this is implemented in linux allows you to create a local socket as per usual AF_LOCAL way, The abstract namespace basically means that it lets you bind sockets to names that are managed via the kernel, rather than filesnames on a filesystem as with regular local sockets. Note that it is also distinct from named pipes.Ībstract sockets are local sockets (AF_LOCAL/AF_UNIX, see previous section) but in the special-cased abstract namespace. This makes them useful for local IPC (both because it's fast and you can't accidentally open it up to the network with the wrong listen() call) While this is also not routable, that's because of the network stack refusing to do so - but since that network stack is still involved, local sockets are simpler and a little faster in comparison. Note this is distinct from localhost IP, which is just a special case - but still within the network stack. Since it does not involve IP, there are no ports It fundamentally cannot be network-routed. Since this is is essentially its own tiny subsystem, Security is mostly the filesystem permissions to that socket file. On the code side it presents a fairly normal socket interface - you can e.g. Named sockets are a somewhat ambiguous name, in that some people use them to refer to abstract sockets, some to named pipes.īSD calls it PF_UNIX, which is #define'd to the same thing.īoth ends of such a socket connect, via code, to what looks like a file on the filesystem. That also allowed wider set of protocols. Technically it was a standardization of early TCP, There is a POSIX socket API, evolved from an earlier Berkeley API. 3.2.6 IPv4-mapped addresses, 6to4, and Teredo.3.2.5 IPv6 general use addresses and ranges.3.2.4 IPv6 addresses may be 128-bit, but the amount of things you hand out is actually more like 48-bit.3.2.3 IPv6 special addresses and ranges.3.2.1 If it's existed for 20 years, are we using it yet?.

2.5.3 TCP_NODELAY and Nagle's Algorithm.2.5.2.1.2 TCP: Possible SYN flooding on port 80.2.5.1.3 Delayed, Cumulative, and Selective ACKs.1.5 Why connections can be on the same port, and binds cannot.1.2 Local sockets / unix domain sockets.

Tcp retransmission wireshark stun protocol