Skip to content

Instantly share code, notes, and snippets.



Created Apr 11, 2017
What would you like to do?
This is memo script that replay the DNS traffic captured in order to load a DNS Server for test purpose.
# To be executed on the DNS server and output to be copied
dip=$(ip addr show dev $dif | egrep -o '(addr:)?([0-9]*\.){3}[0-9]*' | head -n1)
dmac=$(ip link show dev $dif | egrep -o '(link/ether:)?([0-9a-f]{2}\:){5}[0-9a-f]{2}' |head -n1)
echo -e "dmac=$dmac \ndip=$dip"
#To be executed on the injector
#Past the previous copied content from the DNS server
sip=$(ip addr show dev $sif | egrep -o '(addr:)?([0-9]*\.){3}[0-9]*' | head -n1)
smac=$(ip link show dev $sif | egrep -o '(link/ether:)?([0-9a-f]{2}\:){5}[0-9a-f]{2}' |head -n1)
time=$(date +"%Y%m%d-%H.%M.%S")
echo $time
# Rewrite IP and mac @ on a new capture
tcprewrite -i dnstraffic01.pcap -S$sip/32 --enet-smac=$smac --enet-vlan=del -D$dip/32 --enet-dmac=$dmac -C -o dnstrafic01-rewritten.$time
#Replay the DNS capture
tcpreplay --enable-file-cache --timer=gtod -i $sif -p 35000 -l0 dnstrafic01-rewritten.$time
#Monitor the bandwith on the DNS server
sar -n DEV 1 1000
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.