L ) ▁is ▁a ▁language ▁commonly ▁used ▁by ▁Internet ▁Service ▁Pro viders ▁to ▁describe ▁their ▁routing ▁policies . ▁ ▁The ▁routing ▁policies ▁are ▁stored ▁at ▁various ▁who is ▁databases ▁including ▁R I PE , ▁R AD B ▁and ▁AP N IC . ▁I SP s ▁( using ▁autom ated ▁tools ) ▁then ▁generate ▁router ▁configuration ▁files ▁that ▁match ▁their ▁business ▁and ▁technical ▁policies . ▁ ▁R FC ▁ 2 6 2 2 ▁describes ▁R PS L , ▁and ▁replaced ▁R I PE - 1 8 1 . ▁ ▁R FC ▁ 2 6 5 0 ▁provides ▁a ▁reference ▁tutorial ▁to ▁using ▁R PS L ▁in ▁practice ▁to ▁support ▁IP v 6 ▁routing ▁policies . ▁ ▁R PS L ▁Tools ▁and ▁Program s ▁▁ ▁R t Config ▁- ▁automatically ▁generate ▁router ▁configuration ▁files ▁from ▁R PS L ▁registry ▁entries ▁( This ▁software ▁is ▁part ▁of ▁the ▁IR R Tool Set ) ▁ ▁ir r PT ▁- ▁Tools ▁for ▁I SP s ▁to ▁collect ▁and ▁use ▁information ▁from ▁Internet ▁Rout ing ▁Reg istry ▁( IR R ) ▁databases ▁ ▁External ▁links ▁ ▁R I PE ▁R PS L ▁page ▁ ▁Category : Internet ▁architecture ▁Category : Rout ing <0x0A> </s> ▁Dar ab ▁County ▁() ▁is ▁a ▁county ▁in ▁F ars ▁Province ▁in ▁Iran . ▁The ▁capital ▁of ▁the ▁county ▁is ▁Dar ab . ▁At ▁the ▁ 2 0 0 6 ▁census , ▁the ▁county ' s ▁population ▁was ▁ 1 7 2 , 9 3 8 , ▁in ▁ 3 9 , 9 5 5