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Packet Captures

ospf over gre tunnel.cap 8.2 KB

Submitted Jun 13, 2012 by altafk

Configured ospf over GRE tunnel in which packets are double tagged with ip header, useful when there is no direct connection between the 2 routers but still we need to run ospf.

GRE IP OSPF

Packets: 63 Duration: 241s Downloads: 10579

NHRP_registration.cap 648 bytes

Submitted Sep 14, 2009

R2 registers a multipoint GRE tunnel with R1. Capture perspective from the R1-R5 link.

Ethernet GRE IP NHRP

Packets: 4 Duration: n/a Downloads: 4415

mGRE_ICMP.cap 3.7 KB

Submitted Sep 14, 2009

R2 begins sending ICMP traffic to R4, but it currently only has a GRE tunnel open to R1. The first two ICMP requests (packets #1 and #4) are routed through R1 while R2 sends an NHRP request to R1 for R4's spoke address. Once a GRE tunnel is dynamically built between spoke routers R2 and R4, R2 begins routing the ICMP traffic directly to R4. Capture perspective from the R2-R5 link.

Ethernet GRE IP NHRP

Packets: 24 Duration: 10s Downloads: 6004

GRE.cap 1.5 KB

Submitted Sep 14, 2009

ICMP is encapsulated into a Generic Routing Encapsulation (GRE) tunnel.

Ethernet GRE IP

Packets: 10 Duration: n/a Downloads: 10684