Hi All, Let me describe my situation: I am trying to check for the DHCPv6 packets (mainly solicit messages) sent to the Router from the CMTS. I have a PC which is connected behind a CMTS in my environment , basically connected to the Switch belonging to the CMTS. And I am able to get any data coming from the CMTS to the Router. I am running wireshark on this particular windows 7 PC and sniffing on the mentioned WAN side But I am unable to sniff "DHCPv6 packets" . My sniffed interface has both Ipv6 and Ipv4 address. whereas If i sniff on the DHCPv6 server machine itself using wireshark I can see the packets . The server machine is a Fedora linux one. I am using wireshar 1.12 and i can see "DHCPv6" protocol enabled under the "enabled protcols" and I can even sniff icmpv6 and other packets , but not DHCPv6 ones asked 19 Aug '14, 14:12  Gourab Majumdar |
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I'm sorry, but for me it's unclear how your environment looks like and where exactly you were sniffing. You are talking about a Cable modem (CMTS??) a router and a Linux DHCP server. Can you please add a drawing of your environment and where exactly you were capturing the traffic.
The setup is as follows :
DHCP linux server is beyond the CMTS . I am trying to capture packets on my win7 PC which is connected to the WAN side interface and is on the same network subnet as the CMTS or DHCPv6 server.