On 10/28/15 7:25 AM, Dan White via Outages wrote:

We've opened a ticket with Level 3 (9896580) regarding intermittent packet loss affecting certain source/destination IP pairs, with certain pairs receiving 100% packet loss, and others passing traffic normally.

For example, we were unable to ping 4.2.2.3, from a particular IP address, but could ping 4.2.2.2, and 4.2.2.4.

We've disabled our Level 3 BGP session while we trouble shoot. This problem was causing some very strange trouble reports from our customers, such as certain sites not working, or working intermittently.

hashing across a particular lag bbundle or router backplane. if you can deterministicaly recreate it with a particular 5 tuple that's what it is. incrementing through the port space is one way for i in `seq 26000 32000`;do curl -svo /dev/null http://destination-thats-approiate --local-port $i--retry-delay 10 ;done if you have circuits on more than one edge router in the pop you may be able to isolate which of the routers it is.