#!/bin/bash
noOfVeths=18
if [ $# -eq 1 ]; then 
    noOfVeths=$1
fi
echo "No of Veths is $noOfVeths"
idx=0
let "vethpairs=$noOfVeths/2"
while [ $idx -lt $vethpairs ]
do 
    intf0="veth$(($idx*2))"
    intf1="veth$(($idx*2+1))"
    idx=$((idx + 1))
    if ! ip link show $intf0 &> /dev/null; then
        ip link add name $intf0 type veth peer name $intf1
        ip link set dev $intf0 up
        ip link set dev $intf1 up
        TOE_OPTIONS="rx tx sg tso ufo gso gro lro rxvlan txvlan rxhash"
        for TOE_OPTION in $TOE_OPTIONS; do
           /sbin/ethtool --offload $intf0 "$TOE_OPTION" off
           /sbin/ethtool --offload $intf1 "$TOE_OPTION" off
        done
    fi
    sysctl net.ipv6.conf.$intf0.disable_ipv6=1
    sysctl net.ipv6.conf.$intf1.disable_ipv6=1
done