v6 fundementals Flashcards
header length?
40 bytes
fields?
version
class
flow label
payload length
next header
hop limit
source
destination
What are v6 extension headers?
additional headers that can be attached to do other things;
hop-by-hop options, signalling each hop needs to look at these.
routing - list of notes that should be visited during transit
fragments - signals that this has been fragmented by the source
destination options - options examined only by the destination – could appear twice.
AH - used with IPsec to verify authenticity
Encrypted security payload - for Ipsec, carries encrypted data.
whats ::1?
loopback IP
how many bits in the address scope?
10 bits
link local?
fe80::/64
whats ::/16?
something special todo with interfaces
slacc steps
Host generates link local and broadcasts an RS message
other devices get the RS and send back an RA
host confirms the RA and uses the RA message to do autoconfiguration
unique local IPs (private IPs). Whats the range?
fc00::/7
whats the ipv6 route table name?
inet6.0
How can you learn the link local IP of a connected host?
You can ping its public IP and then do;
show ipv6 neighbors
When is ND considered done?
when traffic is flowing.
Whats the difference between v4 and v6 when configuring protocols?
OSPF:
is-is - everything else is pretty much the same
is-is - same process, just add the inet6 family.
bgp - same - you’re just configuring v6 neighbour addresses
v6 tunnelling… What do?
tunnel v6 in a v4 header.
its basically gre - gr interface, tunnel source and destination configured both ends, and then define the address family you’re tunneling over it, plus the p2p ips.
then just setup overlay routing with a next hop of the tunnel interface.
