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|    comp.protocols.tcp-ip    |    TCP and IP network protocols.    |    14,669 messages    |
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|    Message 13,360 of 14,669    |
|    Jorgen Grahn to Madhur    |
|    Re: Virtual IP setup Problem    |
|    21 Dec 09 07:55:44    |
      be9fb89e       From: grahn+nntp@snipabacken.se              On Sat, 2009-12-19, Madhur wrote:       > I am trying to run multiple network nodes (A, B, C, D and E). Each       > node requires unique IP address to be assigned. Due to crunch of linux       > machines at home, I planned to use Virtual IP,              What does Virtual IP mean to you? I don't think there is a common       definition (despite the Wikipedia entry, which seems to       connect/confuse it with VLAN (IEEE 802.1Q) somehow).              If it's just "assign many addresses to the same interface", don't       expect them to work as separate IP stacks with e.g. routing inbetween.              > running A, B, C and D       > on Machine 1 and E on Machine 2. An IP packet is expected to travel       > from D to C, C to B and B to outside network. On the other way around       > from the outside network -> B, B->C and C->D.              So it's              outside -- B -- C -- D        -----------        machine 1              Where did A and E go?              > Lets I ping a machine       > in the outside network. I can see the packet traversing       > D->C, C->B B->outside network and on the way around       > outside network ->B, B->C, C->D, but the ping response is not shown       > at command prompt. This means       > the packet is getting dropped at the IP stack of Machine 2.              There is something wrong with your description -- that machine       is not involved.              > When I had close look at the packets, I could observe that packets       > which are coming out from C->D were with Ethernet MAC address being       > all zeroes. This might be the cause of IP packets getting dropped. Is       > there a solution I can avoid so that packets are not dropped. When I       > start doing pinging C from D, ping packets from the outside network       > gets displayed. For time being temporary solution, I start redundant       > ping which keeps pinging C from D.       > This problem is almost killing my multiple node issue. I kindly       > request for help.              You need to clarify your question.              /Jorgen              --        // Jorgen Grahn |
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