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nixpkgs/lib/qemu-flags.nix
Eelco Dolstra b3dbcbe249 * Use vde_switch instead of QEMU's multicast feature to tie QEMU VMs
together into virtual networks.  This has several advantages:

  - It's more secure because the QEMU instances use Unix domain
    sockets to talk to the switch.

  - It doesn't depend on the host's network interfaces.  (Local
    multicast fails if there is no default gateway, so for instance it
    fails if a laptop is not connected to any network.)

  - VDE devices can be connected together to form arbitrary network
    topologies.

  - VDE has a "wirefilter" tool to emulate delays and packet loss,
    which are useful for network testing.

svn path=/nixos/trunk/; revision=25526
2011-01-12 18:47:23 +00:00

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Nix

# QEMU flags shared between various Nix expressions.
{
qemuNICFlags = nic: net: machine:
"-net nic,vlan=${toString nic},macaddr=52:54:00:12:${toString net}:${toString machine},model=virtio " +
"-net vde,vlan=${toString nic},sock=$QEMU_VDE_SOCKET_${toString net} ";
}