Daniel,
The question sure is a communication one not TSM so the answer is in the
same area. So the answer:
Default gateway is a simple solution for small networks and *single* route
to the universe (star or tree topologies). For networks with mesh-topology
(be they LAN or WAN) a routing protocol ought to be used to prevent
inefficient routes.
- if network administrators responsible for that customer's site
have not implemented routing protocol the discussion is over - the answer
is "bad network design, it is a problem TSM cannot resolve".
- if routing protocol is in place - you or the sysadmin for the AIX
box ought to configure routing daemon (routed or gated) in "passive"
(listening-only) mode. Default gateway should not be defined - it would
come through routing protocol advertizement. This should solve the
problem.
Zlatko Krastev
IT Consultant
Daniel Sparrman <daniel.sparrman AT EXIST DOT SE>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
17.01.2003 08:24
Please respond to "ADSM: Dist Stor Manager"
To: ADSM-L AT VM.MARIST DOT EDU
cc:
Subject:
Hi
This is perhaps more of a communication question rather than a storage
management question, but I will still ask, considering some of you out
there should have encountered this problem.
One of our customers have a P-Series 610 running AIX ML 4.3.3.09. It's
equipped with 2 100Mbs Ethernet adapters and one GB adapter. Previously,
they all were located on the same subnet. Now, we've move the GB adapter
into a separate subnet.
The configuraiton looks like this:
1st 100Mbs Ethernet = 192.168.1.1/24 default gateway 192.168.1.254
2nd 100Mbs Ethernet = 192.168.1.2/24
1st Gigabit Ethernet = 192.168.5.1/24
This has become a problem. Everytime a client connects to the TSM server,
it responds from the adapter which have the default gateway set. The
customer is running spanning tree, which means that it wont allow the TSM
server to receive data on one adapter, and respond from another. However,
I
haven't found a way to have the TSM server respond from the same adapter
on
which the client connected. In my opinion, this can only be solved in to
ways; either having a default gateway for each adapter, or, setting some
kind of option, telling the TSM server to awalys respond on the same
adapter on which it received the data.
BUT, the first alternative doesnt work. AIX 4.3.3.09, in contrary to 5L,
wont let me set multiple default gateways, specifying one for each
adapter.
In AIX 5L, I have the option, when setting static routes, of binding the
static route to a specific adapter. When trying to add a second default
gateway on AIX 4.3.3.09, it only tells me that there is already a default
gateway.
The second alternative, however, seems theoretically impossible. The AIX
server shouldnt be able to respond to a client, connection from a
different
subnet, from the adapter on which it received the initial client session.
This is because the adapter dont have a default gateway, and therefore
shouldn't be able to find it's way to the client, located on a different
subnet.
This problem still existed when we had all adapters running on the same IP
subnet. The GB adapter could recieve data initiated from the clients, but
the respones always went through the first 100Mbs ethernet adapter, which
had the default gateway.
Is there anybody out there running an AIX server with multiple adapters,
which have multiple subnets, and has been able to have the AIX respond to
the client on the same adapter on which the client initially started the
IP
session?
Perhaps I'm not a communication expert, but to me, this seems like a
fairly
simple problem.
Best Regards
Daniel Sparrman
-----------------------------------
Daniel Sparrman
Exist i Stockholm AB
Propellervägen 6B
183 62 HÄGERNÄS
Växel: 08 - 754 98 00
Mobil: 070 - 399 27 51
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