Packet Captures

BGP_MP_NLRI.cap (2.9 KB)

IPv6 routes are carried as a separate address family inside MP_REACH_NLRI attributes.

• Categories: Routing Protocols
• Protocols: BGP, Ethernet, IP, IPv6, TCP

4-byte_AS_numbers_Mixed_Scenario.cap (414 bytes)

• Categories: Routing Protocols
• Protocols: BGP, HDLC, IP, TCP

rpvstp-access.pcap.cap (3.7 KB)

Rapid per-VLAN spanning tree capture of an access port (without portfast), configured in VLAN 5.

• Categories: Switching
• Protocols: DNS, Ethernet, IP, LLC, LOOP, STP, UDP

BGP_MD5.cap (1.7 KB)

An EBGP with TCP MD5 authentication enabled

• Categories: Authentication, Routing Protocols
• Protocols: BGP, Ethernet, IP, TCP

OSPF_Down-Bit.cap (8.9 KB)

LSA Update with down bit set. Router R5 56.0.0.5 PE is receiving an update from the MPLS VPN, which is advertised to CE 56.0.0.6 ospf routing table. In order for for the packet(LSA) not to be re-advertised back into the MPLS cloud through another PE(2) router, PE sets the Down-bit to 1. filter: ospf.v2.options.dn == 1

• Categories: Routing Protocols
• Protocols: CDP, HDLC, IP, OSPF, SLARP

EoMPLS.cap (7.0 KB)

Routers at 1.1.2.1 and 1.1.2.2 are PEs in a MPLS cloud. LDP starts at packet 8 and they build up a pseudo-wire VC (last FEC in packets 11 and 13). At packet 15 we already have STP running between CE1 and CE2 (two routers with ESW), encapsulated in 2 MPLS headers. All the ethernet stuff follows: CDP, ARP, ICMP between two hosts on the same subnet.

• Categories: MPLS
• Protocols: Ethernet, IP, LOOP, MPLS, TCP, UDP

PIM_register_register-stop.cap (258 bytes)

Switch at 192.168.0.6 receives an IGMP request for the group 239.1.2.3, encapsulates the original IGMP packet in a PIM Register and sends it to the RP at 192.168.1.254. In packet #2 RP sends a Register-Stop to the switch.

• Categories: Multicast
• Protocols: Ethernet, IP, PIM

VRRP_preempt.cap (1.2 KB)

Initially R3 is the master, R2 is backup, and R1 is offline. R1 comes back online with a priority of 200, preempting R3 to become the master router.

• Categories: Redundancy
• Protocols: Ethernet, IP, VRRP

telnet.cap (7.3 KB)

Telnetting from one router to another. Note that all communication is visible in clear text.

• Categories: Management
• Protocols: Ethernet, IP, TCP, Telnet

SSHv2.cap (11.4 KB)

An SSH version 2 session between two routers. All communication is securely encrypted.

• Categories: Encryption, Management
• Protocols: Ethernet, IP, SSH, TCP

RIPv2_subnet_down.cap (1.3 KB)

RIPv2 routes are being flooded on the R1-R2 link. R2's connection to 192.168.2.0/24 goes down, and the route is advertised as unreachable (metric 16) in packet #7. Capture perspective from R1's 10.0.0.1 interface.

• Categories: Routing Protocols
• Protocols: Ethernet, IP, RIP, UDP

RIPv1_subnet_down.cap (1.0 KB)

RIPv1 routes are being flooded on the R1-R2 link. R2's connection to 192.168.2.0/24 goes down, and the route is advertised as unreachable (metric 16) in packet #5. Capture perspective from R1's 10.0.1.1 interface.

• Categories: Routing Protocols
• Protocols: Ethernet, IP, RIP, UDP

RADIUS.cap (775 bytes)

A RADIUS authentication request is issued from a switch at 10.0.0.1 on behalf of an EAP client. The user authenticates via MD5 challenge with the username "John.McGuirk" and the password "S0cc3r".

• Categories: Authentication
• Protocols: Ethernet, IP, RADIUS, UDP

PPP.cap (3.6 KB)

ICMP across a PPP serial link.

• Categories: None
• Protocols: CDP, ICMP, IP, LCP, PPP