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know-how:tools [2021/02/09 07:17] – [wipe] ccknow-how:tools [2024/02/26 10:30] (aktuell) cc
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 +~~ODT~~
 ====== Need to have ====== ====== Need to have ======
  
Zeile 518: Zeile 519:
  
 For detailed information see the manual. For detailed information see the manual.
 +</code>
 +  * **Uptime** bei tcp-timestamps ermitteln / ist **keine exakte Wissenschaft**
 +  * https://floatingoctothorpe.uk/2018/detecting-uptime-from-tcp-timestamps.html
 +<code>
 +hping3 --count 2 --syn --destport 22 --tcp-timestamp 10.0.23.245
 +HPING 10.0.23.245 (eth0 10.0.23.245): S set, 40 headers + 0 data bytes
 +len=56 ip=10.0.23.245 ttl=64 DF id=0 sport=22 flags=SA seq=0 win=65160 rtt=7.6 ms
 +  TCP timestamp: tcpts=1138723235
 +
 +len=56 ip=10.0.23.245 ttl=64 DF id=0 sport=22 flags=SA seq=1 win=65160 rtt=3.5 ms
 +  TCP timestamp: tcpts=1138724235
 +  HZ seems hz=1000
 +  System uptime seems: 13 days, 4 hours, 18 minutes, 44 seconds
 +
 +
 +--- 10.0.23.245 hping statistic ---
 +2 packets transmitted, 2 packets received, 0% packet loss
 +round-trip min/avg/max = 3.5/5.6/7.6 ms
 +
 +</code>
 +
 +===== consumeDHCP =====
 +  * DHCP Server leases aufsaugen / mit **clean** werden die Reservierungen wieder **released**  getestet mit Debian Bookworm u. dnsmasq 2.89
 +  * **consumeDHCP.sh**
 +
 +<code>
 +#!/bin/bash
 +
 +NIC_INTERFACE="$1"
 +NUMBER="$2"
 +BRIDGE_NAME="br-dhcp"
 +
 +
 +function bailout 
 +{
 + echo -e "$1"
 + echo -e "Usage: $0 nic Number_of_Ips"
 + echo -e "Usage: $0 clean"
 + exit 2
 +}
 +
 +function clean
 +{
 + count="1"
 + tap_names="tap-foo-hoo"
 + while ( ip addr ls "$tap_names-$count" &>/dev/null ) 
 + do
 + echo "releasing: $tap_names-$count ..."
 + dhclient -r --no-pid -d -lf /var/lib/dhcp/dhclient-"$tap_names-$count".lease "$tap_names-$count"
 + ip li set dev "$tap_names-$count" down 
 + ip li del "$tap_names-$count"
 + ((count++))
 +        done
 +
 + pgrep -a "dhclient" | grep "tap-foo-hoo" | awk '{print $1}' | xargs kill -9 &>/dev/null
 +
 +}
 +
 +which macchanger > /dev/null || bailout "Cannot find macchanger : apt-get install macchanger"
 +which ip > /dev/null || bailout "Cannot find ip to create tap interface: apt-get install iproute2"
 +which dhclient > /dev/null || bailout "Cannot find dhclient: apt-get install isc-dhcp-client"
 +
 +[[ $# != 2 && $# != 1 ]] && bailout "Parameters missing.."
 +
 +if [ "$1" == "clean" ] ; then
 +clean
 +exit 0
 +
 +fi
 +
 + (( NUMBER > 0 ))  || bailout "Number needs to be more than 0"
 +
 +ip addr ls $NIC_INTERFACE &> /dev/null || bailout "Cannot find interface: $NIC_INTERFACE"
 +
 +clean
 +
 +ip li set dev $NIC_INTERFACE up
 +
 +for i in $(seq 1 $NUMBER); do
 +  tap_names="tap-foo-hoo-$i"
 + ip li add link $NIC_INTERFACE "$tap_names" type macvlan
 + ip li set dev "$tap_names" down
 + macchanger -r "$tap_names" > /dev/null
 + ip li set dev "$tap_names" up
 +
 +  dhclient --no-pid -lf /var/lib/dhcp/dhclient-"$tap_names".lease "$tap_names" &
 +  
 +done
 +
 +
 +exit 0
 </code> </code>
  
know-how/tools.1612851446.txt.gz · Zuletzt geändert: 2021/02/09 07:17 von cc