http://www.techietek.com/wp-content/uploads/2014/05/techietek-web.gif 0 0 techie_admin http://www.techietek.com/wp-content/uploads/2014/05/techietek-web.gif techie_admin2014-11-13 16:48:292014-11-13 16:49:27what is hlim in icmpv6 packet
Very trival question but it was something I was looking around for about the term hlim definition is in an IPv6 ICMP packet such as the below:
IPv6 ICMP Ping
#> ping 2001:7f8:1::1200:1
PING6(56=40+8+8 bytes) 2001:7f8:1::6839:1 --> 2001:7f8:1::1200:1
16 bytes from 2001:7f8:1::1200:1, icmp_seq=0 hlim=64 time=15.491 ms
16 bytes from 2001:7f8:1::1200:1, icmp_seq=1 hlim=64 time=14.159 ms
16 bytes from 2001:7f8:1::1200:1, icmp_seq=2 hlim=64 time=14.672 ms
hlim: Hop Limit, Number of hops until the packet gets discarded and is the equivalent of TTL in IPv4.
IPv6 Packet Header Details
- Version (4 bits): IP version. Always 6.
- Traffic class (8 bits): Used for QoS. Like the TOS field in IPv4. RFC 2474.
- Flow label (20 bits): Used for packet labelling, End-to-end QoS. RFC 6437.
- Payload length (16 bits): Length of the payload following the header in bytes. Limits packet size to 64 KB.
- Next header (8 bits): Code for the following extension header or UL protocol. Like protocol type field in IPv4.
- Hop limit (8 bits): Number of hops until the packet gets discarded. TTL in IPv4.
- Source address (128 bit): IPv6 source address.
- Destination address (128 bits): IPv6 destination address.