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For the endpoints on overlay network set the MTU to 1450 to avoid fragmentation when the vxlan header gets added 

Signed-off-by: Santhosh Manohar <santhosh@docker.com>
This commit is contained in:
Santhosh Manohar 2015-09-02 08:31:45 -07:00
parent 94453a45cb
commit 1426728a64
2 changed files with 18 additions and 1 deletions
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18
libnetwork/drivers/overlay/joinleave.go
View File

@ -35,15 +35,31 @@ func (d *driver) Join(nid, eid string, sboxKey string, jinfo driverapi.JoinInfo,
return err
}
// Set the container interface and its peer MTU to 1450 to allow
// for 50 bytes vxlan encap (inner eth header(14) + outer IP(20) +
// outer UDP(8) + vxlan header(8))
veth, err := netlink.LinkByName(name1)
if err != nil {
return fmt.Errorf("cound not find link by name %s: %v", name1, err)
}
err = netlink.LinkSetMTU(veth, vxlanVethMTU)
if err != nil {
return err
}
if err := sbox.AddInterface(name1, "veth",
sbox.InterfaceOptions().Master("bridge1")); err != nil {
return fmt.Errorf("could not add veth pair inside the network sandbox: %v", err)
}
veth, err := netlink.LinkByName(name2)
veth, err = netlink.LinkByName(name2)
if err != nil {
return fmt.Errorf("could not find link by name %s: %v", name2, err)
}
err = netlink.LinkSetMTU(veth, vxlanVethMTU)
if err != nil {
return err
}
if err := netlink.LinkSetHardwareAddr(veth, ep.mac); err != nil {
return fmt.Errorf("could not set mac address to the container interface: %v", err)

1
libnetwork/drivers/overlay/overlay.go
View File

@ -21,6 +21,7 @@ const (
vxlanIDStart = 256
vxlanIDEnd = 1000
vxlanPort = 4789
vxlanVethMTU = 1450
)
type driver struct {