NANOG Operational TTL Alert for 160-bit Headers (aka IPv4)

Sat Mar 3 23:02:29 UTC 2012

Common Misconception - IPv4 is Out of Address Space

NANOG Operational TTL Alert for 160-bit Headers (aka IPv4)

The 8-bit TTL field is reduced to 4-bits plus two 11 bits stuck at 1
for a long time

The new 8-bit fields are: SD11TTTT

Packets without the 11 will enter Deep Packet Inspection processing (slow)

SD are new Source and Destination Address bits set via the generic
AAAA 128-bit records

4+8+12+30+6 = 60 + 68 = 128

VRHL+111.T1.000+Port12+30+Frag6

T1 sets the TTL bits - Use T0 at your own risk - VRHL=0101=5

NANOG.GURU.☺