Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

GRE

Hello,

I was wondering if anyone had a PCAP of GRE? Thank you

10 REPLIES
New Member

Re: GRE

anyone

Bronze

Re: GRE

hi

what you mean by PCAP!!

Cisco Employee

Re: GRE

Kamal,

I think Joshua is referring to PCAP as in Packet Capturing.

- Arul

New Member

Re: GRE

Yes, I need a Packet Capture of GRE.

Thank you Arul

Bronze

Re: GRE

hi

yes indeed you re right PCAP stands for packet capture,thanx

i think the most of tools over there in the field such as ethereal do have filters i.e you can choose weither to capture TCP or IPX but not sure for GRE... so do a check .

other thing if you are in multilayer environment think of using SPAN, this feature works for bothe switched ports and routed ports your case i think is routed ports since you are dealing with GRE tunnels, so capture the whole traffic to an analyser tool and filter out only your GRE.

HTH

do rate if it does help

New Member

Re: GRE

Yes, I would like to but I don't have access to that environment. So I was wondering if anyone just happen to have a capture.

Re: GRE

Hi,

I think I can help you.

I have successfully used ethereal to capture BGP, OSPF, LDP, etc. I don't think it's a problem to capture the GRE packets.

Please wait a day or two so I can prepare for it.

SSLIN

New Member

Re: GRE

Great thank you

Re: GRE

Hi,

I captured the GRE packets in my home lab yesterday. It was captured from a simple topology with 4 router in series: r1,r2,r3,and r4. All of them were running OSPF and the GRE tunnel was created between r1 and r4. Several type of packets were created to run over the GRE tunnel : EIGRP, ICMP, and TELNET.I hope you can enjoy analyzing these packets.Let me know if you have any problem.

SSLIN

New Member

Re: GRE

Thank you very much, I appreciate it. Have a good safe holiday mate.

166
Views
4
Helpful
10
Replies