tap devices, ddp, multicast

[Olaf Hering <olh@xxxxxxx>]

Hi,

is there a way to use the ddp protocol over a tap device?

I use Mac-on-Linux (http://www.maconlinux.org) and have a running
network connetion, over eth0 or over a tap device with MASQ.

I can see other Macs in the Apple chooser if I go over eth0, but when I
use tap0 the local netatalk server can't start multicast. This is not
enabled in the ethertap driver, the following patch solve this:


--- linux-2.2.14.SuSE/drivers/net/Config.in     Mon May  8 09:42:18 2000
+++ OLAF/drivers/net/Config.in  Sun May 14 16:57:59 2000
@@ -23,6 +23,9 @@
 if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
   if [ "$CONFIG_NETLINK" = "y" ]; then
      tristate 'Ethertap network tap' CONFIG_ETHERTAP
+    if [ "$CONFIG_ETHERTAP" != "n" ]; then
+      bool 'Enable Multicast for tap devices' CONFIG_ETHERTAP_MC
+    fi
   fi
 fi
 

netatalk is now happy, but it can't register the atalk devices. I can
them only access via the IP address.

I use there commands to setup the tap0 device:

 /sbin/ifconfig tap0  192.168.200.1 netmask 255.255.255.0 up arp
 /sbin/route add -host 192.168.200.1 tap0
 echo "1" > /proc/sys/net/ipv4/conf/tap0/proxy_arp
 /sbin/arp -s 192.168.200.2 FE:FD:00:00:00:00 pub
 echo "1" > /proc/sys/net/ipv4/ip_forward

After mol is up and running I have to use another hw address, otherwise
MacOS tries to talk to itself.

 /sbin/ifconfig tap0 down
 /sbin/ifconfig tap0 multicast hw ether FE:FD:00:00:00:01 up

Now I have a IP network between Linux and MacOS.



Is there a way to enable ddp over the tap device?
Or is this not possible per definition?



Gruss Olaf

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