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Packet Captures

Showing 151 - 166 of 166

EIGRP_goodbye.cap 1.3 KB

Submitted Sep 14, 2009

R2 designates its interface facing R1 as passive. The final hello message from R2 (packet #9) has all its K values set to 255, designating the message as a "goodbye." Capture perspective is from R1's 10.0.0.1 interface.

EIGRP Ethernet IP

Packets: 15 Duration: 43s Downloads: 6595

EIGRP_adjacency.cap 5.1 KB

Submitted Sep 14, 2009

Formation of an EIGRP adjacency between routers R1 and R2. Capture point is R1's 10.0.0.1 interface.

EIGRP Ethernet IP

Packets: 53 Duration: 104s Downloads: 9009

EIGRPv2_subnet_transition.cap 5.3 KB

Submitted Sep 14, 2009

R4's 2001:db8:0:400::/64 subnet goes down, then comes back up roughly thirty seconds later. Capture perspective from R1's 2001:db8:0:12::1 interface.

EIGRP Ethernet IPv6

Packets: 49 Duration: 65s Downloads: 5428

EIGRPv2_adjacency.cap 4.1 KB

Submitted Sep 14, 2009

Routers 1 and 2 form an EIGRPv2 adjacency and exchange IPv6 routes.

EIGRP Ethernet IPv6

Packets: 31 Duration: 52s Downloads: 7185

EBGP_adjacency.cap 2.7 KB

Submitted Sep 14, 2009

The external BGP adjacency between routers 1 and 2 is brought online and routes are exchanged. Keepalives are then exchanged every 60 seconds. Note that the IP TTL (normally 1) has been increased to 2 with ebgp-multihop to facilitate communication between the routers' loopback interfaces.

BGP Ethernet IP TCP

Packets: 24 Duration: 182s Downloads: 6940

DTP.cap 934 bytes

Submitted Sep 14, 2009

Dynamic Trunking Protocol (DTP) emanated from a Catalyst 3560 every 60 seconds, both with and without ISL encapsulation.

DTP Ethernet ISL LLC

Packets: 10 Duration: 120s Downloads: 7467

BGP_soft_reset.cap 2.0 KB

Submitted Sep 14, 2009

R1 performs a soft bidirectional reset (clear ip bgp soft) on its adjacency with R2. The ROUTE-REFRESH message is visible in packet #7. Note that the TCP connection remains uninterrupted, and neither router views the reset as disruptive.

BGP Ethernet IP TCP

Packets: 17 Duration: 180s Downloads: 5904

BGP_notification.cap 764 bytes

Submitted Sep 14, 2009

R1 has been misconfigured to expect R2 to reside in AS 65100. R2 attempts to peer with R1 advertising itself correctly in AS 65200. R1 issues a NOTIFICATION in packet #5 citing a "bad peer AS" error and terminates the TCP connection.

BGP Ethernet IP TCP

Packets: 9 Duration: n/a Downloads: 5985

BGP_hard_reset.cap 3.2 KB

Submitted Sep 14, 2009

A hard reset (clear ip bgp) is performed on R1 for its adjacency with R2. Packet #7 shows R1 sending a packet with the TCP FIN flag set, indicating the connection is to be torn down. The TCP connection is then reestablished and UPDATEs are retransmitted.

BGP Ethernet IP TCP

Packets: 32 Duration: 208s Downloads: 5727

BGP_AS_set.cap 1.6 KB

Submitted Sep 14, 2009

Packet #15 includes a BGP update containing both an AS sequence and an AS set in its AS path attribute.

BGP Ethernet IP TCP

Packets: 18 Duration: 1s Downloads: 6885

Auto-RP.cap 726 bytes

Submitted Sep 14, 2009

Routers 2 and 3 have been configured as candidate RPs, and multicast RP announcements to 239.0.1.39. Router 1 is the RP. R1 sees the candidate RP announcements from R2 and R3, and designates R3 the RP because it has a higher IP address (3.3.3.3). R1 multicasts the RP mapping to 224.0.1.40. The capture is from the R1-R2 link.

Auto-RP Ethernet IP UDP

Packets: 9 Duration: 239s Downloads: 5584

802.1X.cap 498 bytes

Submitted Sep 14, 2009

A wired client authenticates to its switch using 802.1x/EAP and MD5 challenge authentication.

EAPoL Ethernet

Packets: 7 Duration: 19s Downloads: 11044

802.1w_rapid_STP.cap 2.3 KB

Submitted Sep 14, 2009

Rapid Spanning Tree Protocol BPDUs are received from a Catalyst switch after connecting to a port not configured for PortFast. The port transitions through the blocking and learning states before issuing a topology change notification (packet #30) and transitioning to the forwarding state.

Ethernet LLC STP

Packets: 30 Duration: 56s Downloads: 10054

802.1D_spanning_tree.cap 1.1 KB

Submitted Sep 14, 2009

IEEE 802.1D Spanning Tree Protocol (STP) advertisements sent every two seconds.

Ethernet LLC STP

Packets: 14 Duration: 26s Downloads: 12087

3725_CDP.cap 390 bytes

Submitted Sep 14, 2009

Cisco Discovery Protocol (CDP) from FastEthernet0/0 of a Cisco 3725 router.

CDP Ethernet LLC

Packets: 1 Duration: n/a Downloads: 5592

3560_CDP.cap 1.2 KB

Submitted Sep 14, 2009

Cisco Discovery Protocol (CDP) advertisements from a Catalyst 3560. Note how much information is offered to a potential attacker.

CDP Ethernet LLC

Packets: 3 Duration: 120s Downloads: 6205

Showing 151 - 166 of 166