It is recommended to do this for performance and security reasons. See Fedora bug #512206. Alternatively you can configure iptables to allow all traffic to be forwarded across the bridge:
Translated into Ubuntu/ufw language, either:
a) disable netfilter on the bridge via /etc/sysctl.conf, /etc/ufw/sysctl.conf or add a file with the above to /etc/sysctl.d or
b) configure iptables to allow all traffic to be forwarded across the bridge by adding the following to /etc/ufw/before.rules:
-I FORWARD -m physdev --physdev-is-bridged -j ACCEPT
Seems this is the relevant line in the IRC conversation:
22:24 < MTecknology> cclausen: May 1 22:24:22 pessum kernel: [19981.061455] [UFW BLOCK] IN=br0 OUT=br0 PHYSIN=eth0 PHYSOUT=vnet1 SRC=192.168.3.6 DST=192.168.1.5 LEN=196 TOS=0x10 PREC=0x00 TTL=63 ID=40752 DF PROTO=TCP SPT=55015 DPT=22 WINDOW=126 RES=0x00 ACK PSH URGP=0
Using libvirt with bridging requires additional configuration. For details, see: wiki.libvirt. org/page/ Networking# Creating_ network_ initscripts
http://
Specifically, this section:
"The final step is to disable netfilter on the bridge:
# cat >> /etc/sysctl.conf <<EOF bridge- nf-call- ip6tables = 0 bridge- nf-call- iptables = 0 bridge- nf-call- arptables = 0
net.bridge.
net.bridge.
net.bridge.
EOF
# sysctl -p /etc/sysctl.conf
It is recommended to do this for performance and security reasons. See Fedora bug #512206. Alternatively you can configure iptables to allow all traffic to be forwarded across the bridge:
# echo "-I FORWARD -m physdev --physdev- is-bridged -j ACCEPT" > /etc/sysconfig/ iptables- forward- bridged rules=ipv4: filter: /etc/sysconfig/ iptables- forward- bridged
# lokkit --custom-
# service libvirtd reload
"
Translated into Ubuntu/ufw language, either: sysctl. conf or add a file with the above to /etc/sysctl.d or before. rules: is-bridged -j ACCEPT
a) disable netfilter on the bridge via /etc/sysctl.conf, /etc/ufw/
b) configure iptables to allow all traffic to be forwarded across the bridge by adding the following to /etc/ufw/
-I FORWARD -m physdev --physdev-