Passive Ethernet Tap

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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Homebrewed Accespoint

Apt-get install hostapd Apt-get install isc-dhcp-server Accesspoint Note1: hostapd won’t work with 2 wlan interfaces from which 1 is connected to Internet. Thus use wired internet via Ethernet. This can be also a phone connected to your USB which acts as hotspot. Note2: hostapd won’t work while wpa_supplicant is active. example hostapd.conf (/etc/hostapd/hostapd.conf) interface=wlan0 ssid=somename […]

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Citrix on Linux

Download latest receiver: https://www.citrix.nl/downloads/citrix-receiver/linux/receiver-for-linux-latest.html For debian: dpkg -i xxxxx.deb if you encounter certificate isssues? sudo ln -s /usr/share/ca-certificates/mozilla/* /opt/Citrix/ICAClient/keystore/cacerts/

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Capture ethernet and wifi traffic

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

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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Filter Tap

Turn your PC (OS linux) with multiple interfaces into a filtered tap. Connect your PC eth0 to a span/monitor port on your switch Connnect a Sniffer, APM, IDM or IPS to eth1, eth2 and/or eth3 1. set eth0 promiscious ifconfig eth0 promisc 2. set eth0 to accept data tc qdisc add dev eth0 ingress 3.a. […]

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WAN in the box

Turn your PC into a WAN simulator To add a delay of 100 msec tc qdisc add dev eth0 root netem delay 100 msec Note, this is one way delay in the outbound direction To add a delay in the inbound direction modprobe ifb ip link set dev ifb0 up tc qdisc add dev eth0 […]

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