You *are* a god... This really should go in the wiki.
-----Original Message----- From: [EMAIL PROTECTED] on behalf of ottomeister Sent: Wed 3/21/2007 9:20 PM To: SunRay-Users mailing list Subject: Re: [SunRay-Users] connecting to servers via dns and broadcast On 3/21/07, Thomas L Baca <[EMAIL PROTECTED]> wrote: > This brings forward the general question of what are the semantics of > -a, -A, and -L. From the docs, the simple rule is to use -a for > "dedicated interconnect" and -A for "shared network". The manual says > that -A also turns on the "LAN connection" a la -L. '-a <interface>' tells SRSS that the subnet attached to that interface is an "interconnect", a subnet that is dedicated to carrying Sun Ray traffic and that has no connectivity to any other subnets. When you set up an interconnect 'utadm' knows that the Sun Rays will need to be told to contact the server at its IP address on the interconnect, so that's how 'utadm' sets up the DHCP parameters for this subnet. The fact that this subnet is an interconnect is remembered; it's a factor when this server tries to decide whether to offer sessions to Sun Ray units, and it's important if this server ever needs to redirect DTUs on the interconnect to other servers on the interconnect. '-L on' tells SRSS that it's OK for this server to offer sessions to Sun Ray units that connect from subnets that are not dedicated interconnects. By default SRSS will offer sessions only to units that connect from subnets that have been declared (by 'utadm -a') to be interconnects. '-A <subnet>' tells SRSS that you want to set up DHCP on this server to deliver parameters to the given subnet, and possibly to issue IP address leases to the given subnet. '-A' tells SRSS that even though you want DHCP to do something for this subnet, the subnet is not an interconnect -- it's just another subnet on a fully-connected internet. . '-A' therefore implies that you want this server to offer sessions to Sun Ray units on non-interconnect subnets, so in addition to setting up DHCP it automatically does the equivalent of '-L on' for you. > In our facility, we have multiple class C IP subnets running on the > same VLAN (we have no direct control of VLAN configs - that's campus > networking) and are starting to have DTUs and servers on various of > the IP subnets (but on the same LAN!). I believe this circumstance is > causing some of our confusion as it may not be common in Sun Ray > deployments. If you have no interconnects then you won't use '-a' at all. Your Sun Rays are on your internet so you'd use '-A' for each subnet where you wanted the Sun Ray server to offer some degree of DHCP service to the subnet. If you didn't want the server to provide DHCP service to any subnets then you'd just run '-L on' once. > Also, this all ties in to the various status flags in the utgstatus > output... How do the T N U A M flags relate to those utadm configs? -a/-A/-L do not affect T or N. T and N are per-host flags. T is "Trusted", which means that that server has demonstrated that it belongs to the same Sun Ray host group as the server you ran 'utgstatus' against. 'N' is "oNline" which means that the server may bid to provide a new session when one needs to be created within its group. (That's controlled by 'utadm -n' and 'utadm -f'.) U, A and M are per-subnet flags. U (for Up) means that this server has recently received Sun Ray group membership announcements from that server over that subnet. A (for Active) means that that server is willing to offer sessions to Sun Ray units that connect to it over that subnet. (So, for instance, a server that is offering sessions only to interconnects will not advertise A on its non-interconnect subnets, and other servers should not automatically redirect units to that server's address on those non-A subnets.) M means that that server considers that subnet to be an interconnect. (M is for Managed. We could have used I for interconnect but with some fonts I looks like l or 1 so we went with M. D for Dedicated was another possibility but we worried that people might mistake it for Down.) So '-a' causes M and causes A on M subnets. '-A' and '-L on' cause A on non-M subnets. U isn't tied to any options, it's produced entirely by packet reception. OttoM. __ ottomeister Disclaimer: These are my opinions. I do not speak for my employer. _______________________________________________ SunRay-Users mailing list [email protected] http://node1.filibeto.org/mailman/listinfo/sunray-users
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