search for: rfc2474

...3 22:34:47.724047823 +0200 @@ -45,6 +45,7 @@ /* * Definitions for IP type of service (ip_tos) */ +#include <netinet/ip.h> #ifndef IPTOS_LOWDELAY # define IPTOS_LOWDELAY 0x10 # define IPTOS_THROUGHPUT 0x08 @@ -57,7 +58,6 @@ * Definitions for DiffServ Codepoints as per RFC2474 */ #include <netinet/in_systm.h> -#include <netinet/ip.h> #ifndef IPTOS_DSCP_AF11 # define IPTOS_DSCP_AF11 0x28 # define IPTOS_DSCP_AF12 0x30 These include directives should really be moved to includes.h - in fact, <netinet/in_systm.h> is...

...orm?s default value. i.e. ?IPQoS none none" should be default setting for OpenSSH. - DSCP=0 rationale The default PHB (a.k.a best effort forwarding behavior) is a class that networks must implement in Diffserv architectures, and it is recommended that DSCP=0 is mapped to the default PHB [RFC2474 4.1]. In practice most network applications use DSCP=0 by default and have not experienced problems like OpenSSH. So DSCP=0 by default is considered a good practice. - References [1] AF21/CS1 changes. https://lists.mindrot.org/pipermail/openssh-unix-dev/2018-April/036788.html [2] Numerous repo...

...se never went into ways to actually MODIFY the “Precedence, Security Option, and/or Compartment” fields in an IP header from what we could tell. The RFC that led us to this information stated: With the advent of DiffServ, intermediate nodes may modify the Differentiated Services Codepoint (DSCP) [RFC2474] of the IP header to indicate the desired Per-hop Behavior (PHB) [RFC2475, RFC2597, RFC2598]. The DSCP includes the three bits formerly known as the precedence field. Because any modification to those three bits will be considered illegal by endpoints that are precedence-aware, they may cause fail...