Remi Denis-Courmont a écrit : > Package: libc6 > Version: 2.7-9 > Severity: normal > Tags: patch > > > Hello, > > Rule 2 of the Destination Address Selection algorithm in RFC3484 > specifies: > > | Rule 2: Prefer matching scope. > | If Scope(DA) = Scope(Source(DA)) and Scope(DB) <> Scope(Source(DB)), > | then prefer DA. Similarly, if Scope(DA) <> Scope(Source(DA)) and > | Scope(DB) = Scope(Source(DB)), then prefer DB. > > This rule makes lots of sense for IPv6 addresses - hosts should not try > to use link-local destinations with global source addresses or > vice-versa. > > However, glibc extends this rule to IPv4 as well: private RFC1918 IPv4 > addresses are taken as a different scope from public IPv6 addresses.
Note that it is note a glibc extension. It is defined in the RFC3484: | IPv4 addresses are assigned scopes as follows. IPv4 auto- | configuration addresses [9], which have the prefix 169.254/16, are | assigned link-local scope. IPv4 private addresses [12], which have | the prefixes 10/8, 172.16/12, and 192.168/16, are assigned site-local | scope. IPv4 loopback addresses [12, section 4.2.2.11], which have | the prefix 127/8, are assigned link-local scope (analogously to the | treatment of the IPv6 loopback address [11, section 4]). Other IPv4 | addresses are assigned global scope. -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [EMAIL PROTECTED] | [EMAIL PROTECTED] `- people.debian.org/~aurel32 | www.aurel32.net -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
