On Fri, Jan 19, 2007 at 04:47:14PM +0100, dlezcano at fr.ibm.com wrote: > This patchset provide a network isolation similar at what > Linux-Vserver provides. It is based on the L2 namespaces and relies on > the mechanisms provided by the namespace. This L3 namespaces does not > aim to bring full virtualization for the network, it provides an IP > isolation which can be reused for Linux-Vserver, jailed application or > application containers. > > A L3 namespace are always L2 s' childs and they can not create more > network namespaces, furthermore, they lose their NET_ADMIN > capability. They share their parent's network ressources. From the > parent namespace, IP addresses are created and assigned to the > different L3 childs. From this point, L3 namespaces can use their > assigned IP address and all computed broadcast addresses. ~~~~~~~~~~~~~~~~~~~ okay, I conclude that this only handles a single address for now. what are your plans to handle entire sets? TIA, Herbert > Because the L3 namespace relies on the L2 virtualization mechanisms, > it is possible to have several L3 namespaces listening on > INADDR_ANY:port without conflict, that's allow to run several server > without modifying the network configuration. > > The loopback is a shared device between all L3 namespaces. To ensure > the 127.0.0.1 address isolation, the sender store its namespace into > the packet, so when the packet arrives, the destination namespace is > already set, because "source" == "destination". By this way, it is > easy to disable the loopback isolation and let the application to talk > with application outside of the namespace via the 127.0.0.1 because we > consider them trusted (like portmap). > > The ifconfig / ip commands will only show IP addresses assigned to the > L3 namespace. When a L3 namespace dies, the assigned IP address is > released to its parent. > > At the IP level, when a packet arrives, the L3 network namespace > destination is retrieved from the destination address. > > At the bind time, the address is checked against the assigned IP > address. > > -- > _______________________________________________ > Containers mailing list > Containers at lists.osdl.org > https://lists.osdl.org/mailman/listinfo/containers
