kvm宿主机要包含以下内核参数
cat <<'EOF' | sudo tee /etc/sysctl.d/bridge.conf > /dev/null
net.bridge.bridge-nf-call-arptables = 0
net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
EOF
sudo sysctl -p /etc/sysctl.d/bridge.conf
kvm虚拟机手工获取IP地址
# 自动获取IP
dhclient eth0
# 释放IP地址
dhclient eht0 -r