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* ZOMG, fixed a giant bug in the networking of distributed VM tests.

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It turns out that all network interfaces in all VMs had the same
  Ethernet address (52:54:00:12:34:56) because we didn't specify any
  with the macaddr=... option.  This can obviously lead to great
  confusion.  For instance, when a router forwards a packet, it can
  actually end up sending the packet to itself because the target
  machine has the same Ethernet address (causing a loop until the TTL
  expires), while the target *also* receives the packet.  It's amazing
  anything worked at all, really.

  So now we just set the Ethernet addresses to 52:54:00:12:<virtual
  network number>:<machine number>.

svn path=/nixos/trunk/; revision=25020
This commit is contained in:
Eelco Dolstra 2010-12-07 00:44:29 +00:00
parent 755c30c7a2
commit 2e38d8cd31
2 changed files with 3 additions and 3 deletions
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2
lib/build-vms.nix
View File

@ -108,7 +108,7 @@ rec {
virtualisation.qemu.options = virtualisation.qemu.options =
lib.flip lib.concatMapStrings interfacesNumbered lib.flip lib.concatMapStrings interfacesNumbered
({ first, second }: qemuNICFlags second first ); ({ first, second }: qemuNICFlags second first m.second);
}; };
} }
) )

4
lib/qemu-flags.nix
View File

@ -2,8 +2,8 @@
{ {
qemuNICFlags = nic: net: qemuNICFlags = nic: net: machine:
"-net nic,vlan=${toString nic},model=virtio " + "-net nic,vlan=${toString nic},macaddr=52:54:00:12:${toString net}:${toString machine},model=virtio " +
# Use 232.0.1.<vlan> as the multicast address to connect VMs on # Use 232.0.1.<vlan> as the multicast address to connect VMs on
# the same vlan, but allow it to be overriden using the # the same vlan, but allow it to be overriden using the
# $QEMU_MCAST_ADDR_<vlan> environment variable. The test driver # $QEMU_MCAST_ADDR_<vlan> environment variable. The test driver