cablemodems and voip

Thu Feb 15 18:58:56 UTC 2001

Something that acts like an arp proxy on your end might do the trick.

chris kleban
  -----Original Message-----
  From: owner-nanog at merit.edu [mailto:owner-nanog at merit.edu]On Behalf Of
Miguel Mata-Cardona
  Sent: Thursday, February 15, 2001 1:19 PM
  To: nanog at merit.edu
  Subject: cablemodems and voip

  Hi, I've been following this list quite a while, I'm a little off topic
but in the need of serious help. You can mail me direct all your help and
I'll post a summary at the end. thanks in advance.

  -----------------------------------------------
  problem:

  We are a cablemodem provider and have disabled the peer to peer options in
our CMTSs to avoid problems with NBT and directed broadcast to our
customers. The network has been split in many nodes around the city and each
node is as follows:

  to other nodes
  |
  |
  -------------
  | router |
  | 10.2.15.1 |
  -------------
  |
  |
  ---------------
  | cable modem |
  | termination |
  | system |
  ---------------
  /\
  / \
  / \
  / \
  me other
  10.2.15.2 10.2.15.3

  As you might guess, under this configuration "me" and "other" won't be
able to ping to each other. We have done some tests with linux setting
"route -net 10.2.15.0 netmask 255.255.255.0 gw 10.2.15.1" and it works but
it does not on win9x. We are looking for this solution because we are
deploying a VoIP to some customers on the same node.

  The above solution, if possible under win9x, would bring a problem because
we are modifying the customer machine instead of our network but is feasible
solution anyway. Is there a way on doing this within our nodes? if not, is
there a way to modify or tweak the win9x routing table?

--------------------------
Miguel Mata-Cardona
CCI El Salvador
mmata at sv.cciglobal.net

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