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 - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
