IPv6 : packet forwarding

IPv6 is described in the IPv6 chapter of Computer Networking: Principles, Protocols and Practice. When a router forwards a packet, it updates some of its fields.


Packet forwarding

The first packet was captured on an ingress interface of a router. The second was captured on its egress interface after having been forwarded. Can you infer the different fields of the forwarded packet ?

# Length Resumé Status
0 40 bytes <IPv6: >
1 40 bytes <IPv6: >  

0000  6000df0400403a40  200107ab00010000  
0010  000000000000000a  200107ab00020000  
0020  000000000000000b                    

0000  `.ß..@:@ ..«....
0010  ........ ..«....
0020  ........        
  • IPv6:
    • Version: 6
    • Traffic Class UB: 0
    • Traffic Class LB: 0
    • Flow Label UB: 0
    • Flow Label LB: 57092
    • Payload Length: 64
    • Next Header: 58
    • Hop Limit: 64
    • Source Address: 2001:7ab:1::a
    • Destination Address: 2001:7ab:2::b
0000  6000df04????????  ????????????????  
0010  ????????????????  ????????????????  
0020  ????????????????                    

0000  `.ß.????????????
0010  ????????????????
0020  ????????        
  • IPv6:
    • Version: 6
    • Traffic Class UB: 0
    • Traffic Class LB: 0
    • Flow Label UB: 0
    • Flow Label LB: 57092
    • Payload Length:
    • Next Header:
    • Hop Limit:
    • Source Address:
    • Destination Address:

Information

Author(s) Olivier Bonaventure
Deadline No deadline
Submission limit No limitation
Category Tags IPv6

Sign in