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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    O  o   .   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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