The 4.2.2.x machines are known to have some pretty heavy handed ICMP rate limits. I'd suggest trying to hit anything on level3 but those... Nick Olsen Network Operations (855) FLSPEED x106 ---------------------------------------- From: "Khurram Khan" <kkhan@brokenflea.net> Sent: Tuesday, October 07, 2014 4:48 PM To: "nanog@nanog.org" <nanog@nanog.org> Subject: Weird Issues within L3 Hi Group, We have a couple of circuits , internet facing with Level 3 and from our edge in San Diego, seeing some packet loss when trying a ping to 4.2.2.4, sourcing from 63.214.184.3. anyone seeing a similar issue ? Packet sent with a source address of 63.214.184.3 !.!!!.!!!!!!!!!!!!!...!!!..!!!!!!.!!.!!!!!!.!..!!.!!.!!!!!!!!!!!!!!!!! !!!!!!!!!.!!.!!!..!!!!!.!!!!.! Success rate is 80 percent (80/100), round-trip min/avg/max = 12/13/16 ms