{"id":3,"date":"2007-07-19T23:33:00","date_gmt":"2007-07-19T23:33:00","guid":{"rendered":"http:\/\/tech.moosaico.com\/blog\/?p=3"},"modified":"2014-03-01T14:35:59","modified_gmt":"2014-03-01T14:35:59","slug":"qemu-over-a-bridge-in-ubuntu-linux","status":"publish","type":"post","link":"https:\/\/thejoyofstick.com\/blog\/2007\/07\/19\/qemu-over-a-bridge-in-ubuntu-linux\/","title":{"rendered":"QEmu over a bridge in Ubuntu Linux"},"content":{"rendered":"

Being a linux user, I use QEmu to save me with those windows applications that I must use on the corporation environment. It all went well until I installed a windows tool that needed icmp to work. As you know, the basic and simple network setup of QEmu just support tcp and udp.<\/p>\n

To have enough freedom I wanted to have my QEmu “machine” with a unique ip address as my notebook do. I pretend to simulate having two different systems over my subnet.<\/p>\n

Let’s configure my Linux Ubuntu 7.04 Feisty to run this environment.<\/p>\n

Let’s use a bridge instead of eth0<\/span> to have two different interfaces.
\nEdit your \/etc\/network\/interfaces<\/span> to look like this<\/p>\n

\r\nauto lo\r\niface lo inet loopback\r\n\r\nauto br0\r\niface br0 inet static\r\n\u00a0 address 10.0.0.17\r\n\u00a0 netmask 255.255.255.240\r\n\u00a0 gateway 10.0.0.30\r\n\u00a0 bridge-ports eth0\r\n<\/pre>\n
We add eth0<\/span> to the bridge group br0<\/span> and configure the allocated ip address to my linux notebook.<\/p>\n
QEmu must be launched adding the options “-net nic -net tap<\/span>” so it uses the tap device. You must “sudo<\/span>” qemu so it can use the device – or configure it so it’s accessible from user mode. I don’t spend time with that and always use “sudo” – it’s just my<\/span> machine.
\nEdit the interface script \/etc\/qemu-ifup<\/span> to add it to br0<\/span>.<\/p>\n
\r\n#!\/bin\/bash\r\necho \"Running \/etc\/qemu-ifup\"\r\necho \"...Bringing up $1 for bridged mode\"\r\nsudo \/sbin\/ifconfig $1 0.0.0.0 promisc up\r\necho \"...Adding $1 to br0\"\r\nsudo \/usr\/sbin\/brctl addif br0 $1\r\n<\/pre>\n
After having my windows running I configured its network ethernet device:<\/p>\n
ip address: 10.0.0.18
\nnetmask:    255.255.255.240
\ngateway:    10.0.0.30<\/p>\n
The name server caches were configured too.<\/p>\n
Et voil\u00e1<\/span>, you have two operating systems on two different<\/span> machines
\nusing each own ip address and completely exposed to your network.<\/p>\n
<\/blockquote>\n","protected":false},"excerpt":{"rendered":"
Being a linux user, I use QEmu to save me with those windows applications that I must use on the corporation environment. It all went well until I installed a windows tool that needed icmp to work. As you know,… Continue Reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6,4],"tags":[],"class_list":["post-3","post","type-post","status-publish","format-standard","hentry","category-emulator","category-ubuntu"],"jetpack_shortlink":"https:\/\/wp.me\/pcmwlL-3","jetpack_sharing_enabled":true,"jetpack_likes_enabled":false,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/posts\/3","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/comments?post=3"}],"version-history":[{"count":3,"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/posts\/3\/revisions"}],"predecessor-version":[{"id":613,"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/posts\/3\/revisions\/613"}],"wp:attachment":[{"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/media?parent=3"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/categories?post=3"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thejoyofstick.com\/blog\/wp-json\/wp\/v2\/tags?post=3"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}