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PACC Week 6 Report

This week I was working on connection between Guests that are located at different Hosts. The solution that worked was Bridged networking (“shared physical device”).

Host configuration

  1. Stop network manager

sudo stop network-manager

  • Create two files with only the word ’exit’ in them. These files are:

/etc/default/NetworkManager /etc/default/NetworkManagerDispatcher

  1. Altering the interface config
  •    Take down the interface that will be bridged

sudo ifdown eth0

  •    Edit /etc/network/interfaces

iface br0 inet dhcp bridge_ports eth0 bridge_stp on bridge_maxwait 0

auto lo br0 iface lo inet loopback

  •    Then

sudo ifup br0

  •  Edit /etc/sysctl.conf

net.bridge.bridge-nf-call-ip6tables = 0 net.bridge.bridge-nf-call-iptables = 0 net.bridge.bridge-nf-call-arptables = 0

  •    Load the settings

sysctl -p /etc/sysctl.conf

  •    Edit /etc/rc.local

/sbin/sysctl -p /etc/sysctl.conf iptables -A FORWARD -p tcp –tcp-flags SYN,RST SYN -j TCPMSS  –clamp-mss-to-pmtu exit 0

  •    To verify changes

tail /proc/sys/net/bridge/* iptables -L  FORWARD

  •    Sample output

root@sst7422-20:/home/sstadmin# brctl show bridge name    bridge id        STP enabled    interfaces br0        8000.180373447ce9    yes        eth0 vnet1 virbr0        8000.fe54006bbb40    yes        vnet0

Guest configuration

virsh edit

   # try this if you experience problems with VLANs

Also I tryed to forward incoming connections from Host to Guest, but it was unsuccessful. I couldn´t start VM and got 512 error message. Usefull link.