VPP/Pure L3 Between Namespaces with /32s

Setup

INDECES=(1 2)
for i in ${INDECES[@]}
do
    INDEX=${i};HNAME=host${INDEX};IP=10.10.1.$((${INDEX}+1));IPGW=10.10.1.1
    #Create namespace
    sudo ip netns add ${HNAME}
    sudo ip link add name vpp2${HNAME} type veth peer name ${HNAME}
    sudo ip link set ${HNAME} netns ${HNAME}
    sudo ip link
    sudo ip netns exec ${HNAME} ip link
    MACADDR=$(sudo ip netns exec ${HNAME} ip link show dev ${HNAME} | grep link | awk '{print $2}')
    echo "MACADDR: ${MACADDR}"
    sudo ip netns exec ${HNAME} tcpdump -i ${HNAME} -w /tmp/tcpdump-${HNAME}.libpcap &
    sudo ip netns exec ${HNAME} ip addr add ${IP}/32 dev ${HNAME}
    sudo ip netns exec ${HNAME} ip addr show ${HNAME}
    sudo ip link set dev vpp2${HNAME} up
    sudo vppctl create host-interface name vpp2${HNAME}
    sudo vppctl show hardware
    sudo vppctl trace add af-packet-input 100
    sudo vppctl ip route add ${IP}/32 via ${IP} host-vpp2${HNAME}
    sudo vppctl show ip fib ${IP}/32
    sudo vppctl set interface ip address host-vpp2${HNAME} 127.0.0.$((${INDEX}+1))/32
    sudo vppctl set ip arp host-vpp2${HNAME} ${IP} ${MACADDR}
    sudo vppctl set int state host-vpp2${HNAME} up
    VPP_MACADDRESS=$(sudo vppctl show hardware host-vpp2${HNAME} | grep "Ethernet address" | awk '{print $3}')
    sudo ip netns exec ${HNAME} ip neigh add ${IPGW} lladdr ${VPP_MACADDRESS} dev ${HNAME}
    sudo ip netns exec ${HNAME} ip link set dev ${HNAME} up
    sudo ip netns exec ${HNAME} ip route add ${IPGW} dev ${HNAME} scope link
    sudo ip netns exec ${HNAME} ip route add default via ${IPGW} dev ${HNAME}
    sudo ip netns exec ${HNAME} ip route
done

Verify

for i in ${INDECES[@]}
do
    INDEX=${i};HNAME=host${INDEX};IP=10.10.1.$((${INDEX}+1));IPGW=10.10.1.1
    for j in ${INDECES[@]}
    do
        PINGIP=10.10.1.$((${j}+1))
        PINGHNAME=host${INDEX}
        if [ ${PINGIP} != ${IP}  ]; then
           echo "Pinging from ${HNAME} to ${PINGHNAME} "
           sudo ip netns exec ${HNAME} ping -c 1 10.10.1.$((${j}+1))
        fi
    done
done
sudo vppctl show trace
for i in ${INDECES[@]}
do
    INDEX=${i};HNAME=host${INDEX};IP=10.10.1.$((${INDEX}+1));IPGW=10.10.1.1
    sudo tcpdump -r /tmp/tcpdump-${HNAME}.libpcap -e
done

Cleanup

sudo ip netns exec ${HNAME} ip link del dev ${HNAME}
ps -ef | grep /tmp/tcpdump-${HNAME}.libpcap | awk '{print $2}' | xargs sudo kill
sudo service vpp restart