vxlan.0

create-vxlan.sh

#!/bin/bash
# What is this: it creates vxlan across two hosts
# does this need multicast on hosts: no, we are using the no learning approach
# How: we are using static popluation of fdb and arp database. (we don't use l2miss or l3miss - maybe we try it on a different script)
# What do i need:
#       two VMs running everywhere, as long as you can do udp between them.
#       modify host1/2 for host ips (your VMs)
#       modify ip1/ip2 and vip1/vip2 for your configuration.
#       the script connect to VMs via ssh. so make sure you have the keys handy
# what can i use it for: VMs/Containers/funky networking. get creative

set -e
host1=192.168.124.89
host2=192.168.124.90

mac1="$(echo 00:60:2f$(od -txC -An -N3 /dev/random|tr \  :))"
mac2="$(echo 00:60:2f$(od -txC -An -N3 /dev/random|tr \  :))"

ip1="11.0.0.4/24"
ip2="11.0.0.5/24"

vip1="11.0.0.4"
vip2="11.0.0.5"
echo "* mac1: ${mac1} mac2:${mac2}"


echo "* create vtep"
ssh "${host1}" "sudo ip link add vxlan100 type vxlan id 100 dstport 4789 local 192.168.124.89 nolearning proxy"
ssh "${host2}" "sudo ip link add vxlan100 type vxlan id 100 dstport 4789 local 192.168.124.90 nolearning proxy"

echo "* create veth"
ssh "${host1}" "sudo ip link add name nic0 type veth peer name vnic0 address ${mac1}"
ssh "${host2}" "sudo ip link add name nic0 type veth peer name vnic0 address ${mac2}"

echo "* add bridge + ifs"
ssh "${host1}" "sudo brctl addbr br100 && sudo brctl addif br100 vxlan100 && sudo brctl addif br100 nic0"
ssh "${host2}" "sudo brctl addbr br100 && sudo brctl addif br100 vxlan100 && sudo brctl addif br100 nic0"

echo "* switch off bridge stp"
ssh "${host1}" "sudo brctl stp br100 off"
ssh "${host2}" "sudo brctl stp br100 off"

echo "* assing ips"
ssh "${host1}" "sudo ip addr add ${ip1} dev vnic0"
ssh "${host2}" "sudo ip addr add ${ip2} dev vnic0"

echo "* bring interfaces up"
ssh "${host1}" "sudo ip link set up dev nic0"
ssh "${host1}" "sudo ip link set up dev vxlan100"
ssh "${host1}" "sudo ip link set up dev br100"
ssh "${host1}" "sudo ip link set up dev vnic0"

ssh "${host2}" "sudo ip link set up dev nic0"
ssh "${host2}" "sudo ip link set up dev vxlan100"
ssh "${host2}" "sudo ip link set up dev br100"
ssh "${host2}" "sudo ip link set up dev vnic0"

echo "* fill fdb addresses + arp entries"
ssh "${host1}" "sudo bridge fdb append ${mac2} dev vxlan100 dst ${host2}"
ssh "${host2}" "sudo bridge fdb append ${mac1} dev vxlan100 dst ${host1}"

ssh "${host1}" "sudo ip neigh add ${vip2} lladdr ${mac2} dev vxlan100"
ssh "${host2}" "sudo ip neigh add ${vip1} lladdr ${mac1} dev vxlan100"

echo "* are you there?"
ssh "${host1}" "ping -c5 ${vip2}"
ssh "${host2}" "ping -c5 ${vip1}"