(Partially reposted, as I screwed up while copy and pasting my configs; sorry for the noise.)
Hello all,
can anyone recommend a better way to achive (guest agnostic) MAC-address
isolation in qemu/kvm than with usermodes/slirp networking? It's too slow.
I have multiple guests on the same host, all requiring identical MAC-addresses.
My current debian setup is as follows:
/etc/network/interfaces:
auto lo
iface lo inet loopback
auto br0
iface br0 inet static
address 192.168.0.1
netmask 255.255.255.0
gateway 192.168.0.254
metric 1
bridge_ports eth0 eth1
bridge_stp off
bridge_fd 0
bridge_maxwait 0
post-up echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time
post-up echo 50 > /proc/sys/net/ipv4/tcp_keepalive_probes
post-up echo 10 > /proc/sys/net/ipv4/tcp_keepalive_intvl
auto natbr0
iface natbr0 inet static
address 10.0.2.2
netmask 255.255.255.0
metric 1
bridge_ports eth0
bridge_stp off
bridge_fd 0
bridge_maxwait 0
pre-up modprobe ip_conntrack_tftp
pre-up modprobe ip_conntrack_ftp
pre-up modprobe ip_nat_tftp
pre-up modprobe ip_nat_ftp
up echo "`route -n | sed -n 's/^0\.0\.0\.0 .* \(.*\)$/\1/p'`" > /var/run/${IFACE}_route
up /usr/sbin/dnsmasq --interface=${IFACE} --except-interface=lo --bind-interfaces --user=nobody \
--dhcp-range=natbr0,10.0.2.15,10.0.2.15,255.255.255.0,10.0.2.255,72h \
--domain=localnet --pid-file=/var/run/${IFACE}_dnsmasq.pid --conf-file
up echo 1 > /proc/sys/net/ipv4/ip_forward
up iptables -A FORWARD -s 10.0.2.0/24 -j ACCEPT
up iptables -A FORWARD -d 10.0.2.0/24 -j ACCEPT
post-up iptables -t nat -A POSTROUTING -o natbr0 -j MASQUERADE
post-up echo 600 > /proc/sys/net/ipv4/tcp_keepalive_time
post-up echo 50 > /proc/sys/net/ipv4/tcp_keepalive_probes
post-up echo 10 > /proc/sys/net/ipv4/tcp_keepalive_intvl
down iptables -D FORWARD -s 10.0.2.0/24 -j ACCEPT
down iptables -D FORWARD -d 10.0.2.0/24 -j ACCEPT
down iptables -t nat -D POSTROUTING -o natbr0 -j MASQUERADE
post-down kill -s TERM `cat /var/run/${IFACE}_dnsmasq.pid` && rm -f /var/run/${IFACE}_dnsmasq.pid
post-down rm -f /var/run/${IFACE}_route
where my "server boxes" are connected as:
/etc/qemu-kvm/qemu-ifup-br:
#!/bin/sh
BRIDGE=br0
/sbin/ifconfig $1 0.0.0.0 up
/usr/sbin/brctl addif $BRIDGE $1
if they need full connectivity,
or as:
/etc/qemu-kvm/qemu-ifup-natbr:
#!/bin/sh
BRIDGE=natbr0
/sbin/ifconfig $1 0.0.0.0 up
/usr/sbin/brctl addif $BRIDGE $1
/sbin/iptables -t nat -A POSTROUTING -o "`route -n | sed -n 's/^0\.0\.0\.0 .* \(.*\)$/\1/p'`" -j MASQUERADE || :
"hidden" behind NAT.
Only my "client boxes" (multiple virtual client boxes on the same server - currently setup using usermode networking) need identical MACs.
They don't need to "talk" to one another, but they do need to be able to talk to the servers and the "outside world".
I'm hoping that maybe someone that's a little more "network savvy" can give me a tip in the right direction.
vlans, ebtables, iptables, ppp, funky NAT setups, etc...
Thanks, and best regards,
Robert
PS. Please BCC me, as I am not on the list.
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