Module : ServerIron ADX Packet Capture
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1 Module : ServerIron ADX Packet Capture
2 Objectives Upon completion of this module, you will be able to: Describe Brocade ServerIron ADX (ADX) Packet Capture feature Configure and verify the Packet Capture feature Define various filters and pattern matching Interpret HTTP packet content Perform the lab exercises 2
3 What is Packet Capture? A packet capture feature allows the user to do the following: Define a set of traffic filters, that when matched, copy the packet to a capture buffer Allows the user to apply these rules to an interface or globally to the ADX Allows the user to analyze and interpret the information collected in a user-friendly readable format 3
4 Configuration Steps for ADX Packet Capture Use the steps below to configure, capture and display packets Turn on the debug filter Set the buffer size Set the packet size Define a filter ID Specify the filter condition (by default all packets are captured) Apply the filter ID to an interface Start and stop the packet capture View the captured packet 4
5 Configuring the Capture Buffer Command allows user to turn on packet capture Syntax: debug filter Example: ADX# debug filter ADX(debug-filter)# The debug filter command is a hidden command 5
6 Setting and Displaying the Buffer Size Sets and displays the buffer size Default setting is zero To use the packet capture tool, the buffer size has to be set to a value between 1 and 1024 Kb Setting the buffer size: Syntax: buffer-size <kbytes> Example: ADX(debug-filter)# buffer-size 128 Showing the buffer size Syntax: show buffer-size Example: ADX(debug-filter)# show buffer-size Capture buffer size: bytes 6
7 Setting the Packet Size Defines the packet size Specify the packet size: Syntax: packet-size <bytes> whole Example: ADX(debug-filter)# packet-size 128 Show the packet-size setting: Syntax: show packet-size Example: ADX(debug-filter)# show packet-size 7
8 Packet Filters Specify filter number 1 Syntax: specify <filter-id> Example: ADX(debug-filter)# specify 1 8
9 Ethernet Filters CLI command mac bcast mac dest <mac-address> mac mcast mac src <mac-address> mac type <type-in-hex> Filter type Ethernet broadcast packets Packets with the specified destination MAC address Ethernet multicast packets Packets with the specified source MAC address Packets of the specified Layer 3 type 9
10 IP Filters CLI command ip bcast IP ip dest <ip-address> ip mcast Filter type broadcast packets Packets with the specified destination IP address IP multicast packets ip protocol <protocol-in-hex> Packets with the specified Layer 4 protocol ip src <ip-address> Packets with the specified source IP address 10
11 TCP Filters CLI command tcp src <port-number> tcp dest <port-number> tcp syn tcp reset tcp fin tcp ack tcp push tcp urgent Filter type Packets with specified source TCP port Packets with specified destination TCP port TCP packets with the SYN flag on TCP packets with the RST flag on TCP packets with the FIN flag on TCP packets with the ACK flag on TCP packets with the PSH flag on TCP packets with the URG flag on 11
12 UDP Filters CLI command Filter type udp src <port-number> udp dest <port-number> Packets with the specified source UDP port Packets with the specified destination UDP port 12
13 Pattern Matching You can set up a filter to capture packets that contain a pattern of a specified length, starting from a specified offset from the beginning of the packet Syntax: pattern <offset> <length> <pattern-in-hex> <offset> is the number of bytes from the start of the packet <length> is the length of the pattern in bytes, specify between 1 through 32 bytes <pattern-in-hex> is the pattern to match and the length of the pattern must be equal to the number of bytes specified with the <length> parameter Example: The filter looks for the pattern 1203 at an offset of 24 bytes from the beginning of the packet. ADX(debug-filter-spec-1)# pattern
14 The show Command for Current Filters When used at the debug-filter-spec-1 prompt, this command displays the current filters: ADX(debug-filter-spec-1)# show Filter-ID: 1 MAC filters: IP filters: TCP filters: UDP filters: Src MAC : ANY Dest MAC : ANY MAC Type : ANY Src IP : ANY Dest IP : ANY Protocol : ANY Src port: ANY Dest port: ANY Flags : None Src port: ANY Dest port: ANY Pattern filters: Pattern : ANY 14
15 Applying Filters Apply filter globally Syntax: apply <filter-id> Example: ADX(debug-filter)# apply 1 Apply filter to an interface Syntax: apply <filter-id> <port-number> [in out] Example: ADX(debug-filter)# apply 1 11 in Apply multiple filters using AND Syntax: apply <expression> [<port-number> [in out]] Example: ADX(debug-filter)# apply "1 and 2" Apply multiple filters using OR Example: ADX(debug-filter)# apply "1 or 2" Imbedding multiple filters: Example: ADX(debug-filter)# apply "(1 and (3 or 4))" View applied expressions: Example: ADX(debug-filter)# show apply Filter ID apply expression: ( 1 and ( 3 or 4 ) ) (If match on both IDs then packet is captured.) (If match on both IDs then packet is captured.) 15
16 Starting and Stopping Packet Capture Syntax: start Example: ADX(debug-filter-all-all)# start Syntax: stop Example: ADX(debug-filter-all-all)# stop Number of packets captured: 0 16
17 Viewing Packets Select this barrel processor (BP) Example: ADX(debug-filter-all-all)# view bp all ADX(debug-filter-1-1)# View a captured packet in ASCII format Example: ADX(debug-filter-1-1)# ascii-dump 5 Save the capture Example: telnet@serverironadx 1000(debug-filter-all-BP)#summary save /usb0/tmp1.txt telnet@serverironadx 1000(debug-filter-all-BP)#ascii-dump save /usb0/tmp2.txt File /usb0/tmp2.txt exists. Are you sure to overwrite it? (enter 'y' or 'n'): 17
18 Viewing Packet Summary ADX(debug-filter-2-1)# summary pkt:1 OUTlen:60 TCP :1131 ->80 Seq: Ack:0 SYN pkt:4 IN len:60 TCP :80 ->1131 Seq: Ack: SYN ACK pkt:5 OUTlen:73 TCP :1131 ->80 Seq: Ack: ACK PSH pkt:8 IN len:60 TCP :80 ->1131 Seq: Ack: ACK pkt:11 IN len:128 TCP :80 ->1131 Seq: Ack: ACK PSH pkt:12 OUTlen:60 TCP :1131 ->80 Seq: Ack:0 RST pkt:15 IN len:60 TCP :80 ->1131 Seq: Ack: ACK FIN pkt:16 OUTlen:60 TCP :1131 ->80 Seq: Ack:0 RST pkt:20 OUTlen:60 IP: > ICMP:Echo Request pkt:23 IN len:60 IP: > ICMP:Echo Reply pkt:24 OUTlen:60 IP: > ICMP:Echo Request pkt:27 IN len:60 IP: > ICMP:Echo Reply pkt:30 IN len:60 IP: > UDP :1029 ->53 pkt:31 OUTlen:60 IP: > ICMP:Echo Request pkt:34 IN len:60 IP: > ICMP:Echo Reply pkt:35 OUTlen:60 MAC:021b.edc2.7f22 ->ffff.ffff.ffff ARP:Request pkt:36 OUTlen:60 MAC:021b.edc2.7f22 ->ffff.ffff.ffff ARP:Request pkt:37 IN len:60 MAC:0010.e000.f6fd ->021b.edc2.7f22 ARP:Reply 18
19 Viewing Packet Details ADX(debug-filter-2-1)# ascii-dump 5 Transmission Control Protocol Port > 80 Sequence Number: Acknowledgement Number: Header Length(MSB 4 bits): 5 (32-bit word) Reserved(LSB 4 bits): 0 Code: 0x18 RES: CON: URG: ACK: PSH: RST: SYN: FIN: Window: Checksum: 0x2bd2 Urgent Pointer: 0x0000 Data: 0000: f f 31 2e 30 0d HEAD / HTTP/ : 0a 0d 0a 19
20 Using ADX Packet Capture Lab 4
21 Using ADX Packet Capture Lab Exercise 21
22 Summary ADX has a packet capture utility that allows you to capture and buffer packets Packet capture needs to be turned on; it is not on by default Filters are defined specifying what the system captures Filters are applied to the interface Captured packets can be displayed in a user friendly format The capture buffer can be saved 22
23 End of Module : ServerIron Packet Capture
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