Packet Captures
LDP_adjacency.cap 5.7 KB
Submitted Sep 14, 2009
PE1 and P1 multicast LDP hellos to 224.0.0.2 on UDP port 646. They then establish an adjacency on TCP port 646 and exchange labels.
| Packets: 61 | Duration: 108s | Downloads: 9751 |
ISIS_p2p_adjacency.cap 21.7 KB
Submitted Sep 14, 2009
Routers 1 and 2 form a L1/L2 adjacency over a point-to-point serial link. Note that both levels of adjacency are managed with a point-to-point (P2P) hello.
| Packets: 26 | Duration: 113s | Downloads: 10149 |
ISIS_level2_adjacency.cap 51.8 KB
Submitted Sep 14, 2009
Routers 3 and 4 form an IS-IS level 2 adjacency.
| Packets: 43 | Duration: 85s | Downloads: 9054 |
ISIS_level1_adjacency.cap 27.4 KB
Submitted Sep 14, 2009
Routers 2 and 3 form an IS-IS level 2 adjacency.
| Packets: 22 | Duration: 58s | Downloads: 7950 |
ISIS_external_lsp.cap 17.0 KB
Submitted Sep 14, 2009
R2 floods the external routes redistributed from RIP into area 10. Packet #9 includes the IP external reachability TLV. Capture perspective from R3's 10.0.10.1 interface.
| Packets: 15 | Duration: 23s | Downloads: 6962 |
ISAKMP_sa_setup.cap 2.0 KB
Submitted Sep 14, 2009
An ISAKMP session is established prior to setting up an IPsec tunnel. Phase one occurs in main mode, and phase two occurs in quick mode.
| Packets: 9 | Duration: n/a | Downloads: 12247 |
IP_in_IP.cap 1.5 KB
Submitted Sep 14, 2009
Direct IP-in-IP tunnel encapsulation (configured in Cisco IOS with tunnel mode ipip).
| Packets: 10 | Duration: n/a | Downloads: 12509 |
ipv6_neighbor_spoofing.cap 6.2 KB
Submitted Sep 14, 2009
IPv6 neighbor spoofing on the local link using a forged ICMPv6 neighbor advertisement.
| Packets: 49 | Duration: 27s | Downloads: 8401 |
IPv6_NDP.cap 2.1 KB
Submitted Sep 14, 2009
Neighbor Discovery Protocol (NDP) uses ICMPv6 to perform duplicate address detection and address resolution. Also includes multicast listener reports.
| Packets: 20 | Duration: 41s | Downloads: 15776 |
IPv6_in_IP.cap 1.5 KB
Submitted Sep 14, 2009
ICMPv6 echos across an IPv6-in-IP tunnel.
| Packets: 10 | Duration: n/a | Downloads: 10670 |
IPsec_ESP-AH_tunnel_mode.cap 2.1 KB
Submitted Sep 14, 2009
Encrypted ICMP across an IPsec tunnel. AH and ESP headers are present.
| Packets: 10 | Duration: n/a | Downloads: 13734 |
IGMPv2_query_and_report.cap 438 bytes
Submitted Sep 14, 2009
R1 issues IGMPv2 general membership queries to the 172.16.40.0/24 segment every 60 seconds. A host replies to each query reporting it belongs to the multicast group 239.255.255.250.
| Packets: 6 | Duration: 126s | Downloads: 8804 |
ICMP_across_frame_relay.cap 1.2 KB
Submitted Sep 14, 2009
A Cisco 3725 pinging its neighbor across a point-to-point frame relay connection.
| Packets: 10 | Duration: n/a | Downloads: 6261 |
ICMP_across_dot1q.cap 1.7 KB
Submitted Sep 14, 2009
A ping issued from 192.168.123.2 to 192.168.123.1 is encapsulated with an IEEE 802.1Q header, placing it in VLAN 123.
| Packets: 15 | Duration: 35s | Downloads: 11981 |
ICMPv6_echos.cap 1.3 KB
Submitted Sep 14, 2009
Five ICMPv6 echo requests and their subsequent replies between routers 1 and 2.
| Packets: 10 | Duration: n/a | Downloads: 7323 |
IBGP_adjacency.cap 2.3 KB
Submitted Sep 14, 2009
Routers 3 and 4 form an internal BGP relationship. This is evidenced by the OPEN messages in packets #4 and #5, which show both routers belong to the same AS (65300). Also note that IBGP packets are not subject to a limited TTL as are EBGP packets.
| Packets: 17 | Duration: 63s | Downloads: 7940 |
HSRP_failover.cap 3.0 KB
Submitted Sep 14, 2009
R1 is the active router, R3 is the standby, and R2 is passive. R1 goes offline and R3 takes over as active after ten seconds. R2 is then promoted to the standby state.
| Packets: 39 | Duration: 47s | Downloads: 7592 |
HSRP_election.cap 3.7 KB
Submitted Sep 14, 2009
The Ethernet link shared by routers 1, 2, and 3 comes online. R1 wins the HSRP election because it has a priority of 200 (versus the default of 100 held by the other two routers). R3 becomes the standby router.
| Packets: 49 | Duration: 57s | Downloads: 7038 |
HSRP_coup.cap 3.9 KB
Submitted Sep 14, 2009
Initially only routers 3 (active) and 2 (standby) are online. R1 comes online with a priority higher than R3's. R1 takes over as the active router (the coup occurs in packet #22) almost immediately. R2 is bumped down to passive and R3 becomes the standby router.
| Packets: 51 | Duration: 49s | Downloads: 6245 |
HDLC.cap 3.4 KB
Submitted Sep 14, 2009
ICMP across an HDLC serial link.
| Packets: 38 | Duration: 111s | Downloads: 6916 |
GRE.cap 1.5 KB
Submitted Sep 14, 2009
ICMP is encapsulated into a Generic Routing Encapsulation (GRE) tunnel.
| Packets: 10 | Duration: n/a | Downloads: 18936 |
GLBP_election.cap 8.4 KB
Submitted Sep 14, 2009
Routers 1, 2, and 3 participate in a GLBP election. R1 becomes the AVG due to having the highest priority (200), and R3 becomes the standby GLBP. All three routers become AVFs.
| Packets: 80 | Duration: 68s | Downloads: 6057 |
Ethernet_keepalives.cap 1012 bytes
Submitted Sep 14, 2009
Loopback keepalives transmitted by an Ethernet interface.
| Packets: 13 | Duration: 120s | Downloads: 5377 |
EIGRP_subnet_up.cap 1.3 KB
Submitted Sep 14, 2009
R4's 192.168.4.0/24 subnet is brought online. R1 receives updates from both R2 and R3 (only R2's update is shown in the capture). The poison-reverse in packet #9 informs R2 not to use R1 as a path to 192.168.4.0/24. The capture perspective is from R1's 10.0.0.1 interface.
| Packets: 15 | Duration: 18s | Downloads: 8055 |
EIGRP_subnet_down.cap 1.8 KB
Submitted Sep 14, 2009
R4's interface to 192.168.4.0/24 goes down and the route is advertised as unreachable. Queries are issued by all routers to find a new path to the subnet but none exists, and the route is removed from the topology. Capture perspective is from R1's 10.0.0.1 interface.
| Packets: 21 | Duration: 23s | Downloads: 6065 |