At 07:39 AM 3/9/05 -0500, jamal wrote:
>...
>Lets list the options and assume there are two sets of addresses those
>for inside the chasis and those for outside:
>
>1) Addresses for intra-chasis communication.
>The addresses used by the blades are intrachasis relevant only and the
>packets never leave the box. The blades are interconnected via some
>L2/VLAN/bridge within the chasis.
>
>Conclusion:
>If these packets never leave the box - no ARP will ever see them and no
>dynamic routing protocol will ever advertise them - therefore no IP
>address collision. You can use _whatever_ address you want, private
>public, IBMs, intels etc. Do we agree on this? In other words hack not
>needed here.
No, I do not agree - you really need to re-read my last post carefully,
making sure you understand what I am saying. Other people have
illustrated the problem as well.
Imagine a simple gateway, connecting two parts of your company - the east
interface connects to a corporate net with a default gateway, the west net
is the software dept. net. Now imagine that you give your internal line card
in this simple gateway a "_whatever_" address, say 18.7.22.69.
Your gateway now has a route 18.7.22.69/32 -> dev linecard
Now please tell me what happens when a guy on the west net tries
to check his MIT evening class schedule.
>a) using private addresses implies possibility of conflict of addresses
>within customer's network. To quote Zdenek:
>You couldn't walk in the NOC and tell them: "You can't use the 10.x
>net to manage your equipment - my box is already using that net".
>Conclusion:
>You walk into the NOC and say "can i use 10.0.0.x/22 subnet" they say "no
>thats going to collide use 10.0.0.0/28"
In real world, where you pay for addresses and for people's time, no one
will give you *their* address for *your* interconnect. Not a public address,
and not a RFC1918 address. Your interconnect is your problem,
they are neither interested nor paid to deal with your design issues.
>a') Using 127.x addresses. You -> NOC "can i use 127.0.0.x/22 subnet"
I know I can use it. I own it as per RFC 3330.
>So tell me what i am missing!
Experience of having built a router. Sorry to be so blunt.
-Zdenek
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