I use this (unsupported) configuration with no problem at all by configuring 
PIM sparse on the switches at each site. (See 
http://en.wikipedia.org/wiki/Sparse_multicast)


I setup a multicast IP in /etc/opt/SUNWut/auth.props, as such:

# Enable Multicast
#       Flag to enable/disable use of multicast in group manager.
#       If disabled, group manager will use broadcast.
enableMulticast = true

# Multicast Address
#       Multicast group address used by group manager.
#       If multicast is enabled, every interface joins this multicast group.
multicastAddress = 239.xx.x.x

# Multicast Time-to-Live
#       Time-to-live parameter for forwarding multicast packets.
#       If set above one, keepalive messages can pass through routers.
multicastTTL = 10

Make sure the mulicastAddress you define is the same on all of your servers, 
and that the group signature has been set properly.

-Bill


-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Kent Peacock
Sent: Monday, May 12, 2008 9:27 AM
To: [EMAIL PROTECTED]; SunRay-Users mailing list
Subject: Re: [SunRay-Users] Trying to get a FOG going over 2 sites.

Collins, Alex wrote:
> Hi All.
>
> I appreciate that this is not supported and may be beyond the bounds of what
> can be done.
>
> We have 2 sites (Chelmsford and Cambridge) and 3 V210's (2 in Chelmsford 1 in
> Cambridge) running SRSS4.
>
> The Sunray Interfaces is connected to a Vlan on each site before being sent
> over the network to the terminals.
>
> The plan is to join the 2 Vlan's together with a GRE Tunnel.
> I have dropped the MTU to 1480 to allow for the overheads in the GRE Tunnel.
>
> The FOG is created and working in Chelmsford.
> I can see all the Terminals on both sites in the Web admin.
> What I cant do is see the Server(s) at the remote site or get the terminals
> to connect through the Tunnel.
>
> Somewhat scrappy Network diagram http://195.194.255.82/Sunray2.gif

This looks like a really, really unsupported configuration. Since the
Sun Rays are on private interconnects, to form a failover group, they
have to be on the same subnet, and within a broadcast or multicast
domain. Here, you have two subnets configured.

Kent
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