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Category: Packet Capture

Wireshark/SSHdump
October 7, 2023
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you have a remote ssh server with tcpdump or dumpcap installed. From a client which has ssh access to the remote server, you can run wireshark on the client and capture live traffic remote. In  case the user needs sudo to capture, wireshark will not prompt for the password. So you need to do the […]

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Cisco Catalyst 3850 sniffer 802.1x
December 1, 2020
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The accesspoints and wireless management interface should have a routable ip address In priv mode on the Cisco catalyst 3850 AP name <name> mode sniffer AP name <name> sniff <dot11a/dot11b> <channel> <ip address sniffer> On the sniffer you can decode traffic from wireless management interface as peekremote  

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ARP in action
January 16, 2019
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In example below we send a ping from host A to host B. Host A doesn’t have an ARP entry for host B. Host B doesn’t have an ARP entry for host A. Step 1. Host A sends an ARP request for host B. Step 2: Host B stores the MAC – and IP address […]

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Passive Ethernet Tap
November 4, 2017
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Just use an ordinary UTP cable Connect 4 walloutlets to the cable as shown below. Use the straight-through cable if you tap an ordinary switched network Use the cross-over cable if you tap an PC directly connected to another network The results may looks lik this   Place you tap (8 wired walloutlets) between a […]

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Capture ethernet and wifi traffic
June 28, 2017
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How to capture ethernet and 802.11 traffiic at once. Use a linux OS PC with wlan interface In a terminal use the following commands: sudo iw dev wlan0 interface add mon0 type monitor sudo ifconfig mon0 up   Start wireshark and select wlan0 and mon0 to capture traffic If needed you can add a capture […]

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Packet Capture Cisco Router
June 25, 2017
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configure an ACL with the adresses/subnets you want to capture i.e. ip access-list extended BUF-FILTER permit ip host <HOST-1> host <HOST-2> permit ip host <HOST-2> host <HOST-1> Create a buffer with total size and packetsize monitor capture buffer BUFFER size 2048 max-size 1518 linear Associate ACL with BUFFER monitor capture buffer BUFFER filter access-list BUF-FILTER […]

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