Date: Thu, 18 Nov 2004 03:59:35 +0200 From: "Chris Dionissopoulos[freemail]" <dionch@freemail.gr> To: <freebsd-net@freebsd.org> Subject: ng_fec with tap interfaces. Message-ID: <002f01c4cd12$427b78b0$0100000a@acer1501>
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Hello,
I'm trying to load-balance and failover 2 lines using ng_fec.
This is my configuraration and schema so far:
LAN-----------------------clients_net
|
[router1]----[box1] -----[router2]
|\---$sp-nat-1 |\---$sp-nat-2
(ISP1) (ISP2)
~\~~~~~~~~~~~~~~~~/~~~
nternet
~~~~~~\~~~~~~~~~/~~~~~~~
\ /
\ /
-------------------------------
|
| <-----$public1,$public2
[ box2 ]
Routing on Box1(freebsd5.3):
~~~~~~~~~~~
IP1 thru router1 , IP2 thru router2
ie.
route add $public1/32 10.0.0.1 (LanIP of router1)
route add $public2/32 10.0.1.1 (LanIP of router2)
Interfaces:
~~~~~~~
openvpn --local 10.0.0.2 --remote $public1 --dev tap0 --ifconfig 10.0.3.1 0xffffff00
openvpn --local 10.0.1.2 --remote $public2 --dev tap1 --ifconfig 10.0.4.1 0xffffff00
tap0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet 10.0.3.1 netmask 0xffffff00 broadcast 10.0.3.255
ether 00:bd:18:6e:45:00
tap1: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet 10.0.4.1 netmask 0xffffff00 broadcast 10.0.4.255
ether 00:bd:bc:0b:49:01
ng_fec:
~~~~~
#ngctl mkpeer fec dummy fec
#ngctl msg fec0: add_iface "tap0"
#ngctl msg fec0: add_iface "tap1"
#ngctl msg fec0: set_mode_inet
#ifoconfig fec0 up
# route add default -iface fec0
Routing on Box2(freebsd5.3):
~~~~~~~~~~~
route add $default $some_gate
Interfaces:
~~~~~~~
openvpn --local $public1 --remote $isp-nat-1 --dev tap0 --ifconfig 10.0.3.2 0xffffff00
openvpn --local $public2 --remote $isp-nat-2 --dev tap1 --ifconfig 10.0.4.2 0xffffff00
tap0: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet 10.0.3.2 netmask 0xffffff00 broadcast 10.0.3.255
ether 00:bd:18:6d:42:00
tap1: flags=28943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500
inet 10.0.4.2 netmask 0xffffff00 broadcast 10.0.4.255
ether 00:bd:be:3b:14:01
ng_fec(same as box1):
~~~~~
#ngctl mkpeer fec dummy fec
#ngctl msg fec0: add_iface "tap0"
#ngctl msg fec0: add_iface "tap1"
#ngctl msg fec0: set_mode_inet
#ifoconfig fec0 up
# route add $clients_net/$clients_mask -iface fec0
Everything works great. Traffic flows both links (for incoming and outgoing), but
I get "fec0: failed to check status of link tap0" and "fec0: failed to check status of link tap1"
messages on console all the time. Also, when one link goes down I start to loose half of
of my traffic (both sides). Searching carefully ng_fec and if_tap source code I found :
------ng_fec.c, line 612-------------------
ifp = p->fec_if;
error = (*ifp->if_ioctl)(ifp, SIOCGIFMEDIA, (caddr_t)&ifmr);
if (error) {
printf("fec%d: failed to check status "
"of link %s\n", priv->unit, ifp->if_xname);
continue;
}
--------------------------------------------
------------if_tap.c, line 484---------------
static int
tapifioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
struct tap_softc *tp = (struct tap_softc *)(ifp->if_softc);
struct ifstat *ifs = NULL;
int s, dummy;
switch (cmd) {
case SIOCSIFFLAGS: /* XXX -- just like vmnet does */
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCGIFSTATUS:
s = splimp();
ifs = (struct ifstat *)data;
dummy = strlen(ifs->ascii);
mtx_lock(&tp->tap_mtx);
if (tp->tap_pid != 0 && dummy < sizeof(ifs->ascii))
snprintf(ifs->ascii + dummy,
sizeof(ifs->ascii) - dummy,
"\tOpened by PID %d\n", tp->tap_pid);
mtx_unlock(&tp->tap_mtx);
splx(s);
break;
default:
s = splimp();
dummy = ether_ioctl(ifp, cmd, data);
splx(s);
return (dummy);
}
return (0);
} /* tapifioctl */
-----------------------------------------
It seems that ng_fec doesn't queries correctly if_tap for link state (default:-> dummy return).
Does anyone has a workaround for this issue or any idea how to implement link-state
mechanism in if_tap device?
If this is imposimple (due to tap device nature) , is possible to add functions in ng_fec for an alternative
link-state mechanism ? (arpings maybe, like linux channel bonding)
thanks for your time,
Chris Dionissopoulos.
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