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Corporate VPN service with separate nets for different users/groups

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Special Forums IP Networking Corporate VPN service with separate nets for different users/groups
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Old 11-17-2009
Corporate VPN service with separate nets for different users/groups
Hi

We are going to host some services for customers with separate private networks for each customer. Each customer will need one or more users.

I have to put up a VPN solution, and I would like to use something that will work on "any" platform, easily, without too much installation/configuration. I feel PPTP is a good option since the "agent" is included on most platforms. We have a firewall/router on a Debian Linux server, and I'd like to extend it's services to include the VPN service. It has access to all nets, so it should be easier to get that to work.

My firewall/router has four interfaces, but only three of concern. eth0 is the outside, eth1 is the inside and eth2 is DMZ. I use proxyarp to get traffic from eth0 to eth2, with iptables filtering. eth1 has three internal nets in the 192.168.* series. The new nets I want to use for customers will be separate VLAN's on that interface with 10.20.x.* addresses. The firewall/router will of course have an IP in each of these (typically .1).

The big question is how to set this up? Can pptpd be used? Should this be done on a separate server?
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LEARN ABOUT HPUX

strmsgsz

STRMSGSZ(5)							File Formats Manual						       STRMSGSZ(5)

NAME

       STRMSGSZ - maximum size of streams message data (bytes)

VALUES

   Failsafe
   Default
   Allowed values
   Recommended values
DESCRIPTION

       This  tunable  limits the number of bytes of message data that can be inserted by or in the data portion of any streams message on the sys-
       tem.  If the tunable is set to zero, there is no limit on how many bytes can be placed in the data segment of the message.

       returns if the buffer being sent is larger than the current value of segments the data into multiple messages.

   Who Is Expected to Change This Tunable?
       Any customer.

   Restrictions on Changing
       Changes to this tunable take effect at next reboot.

   When Should the Value of This Tunable Be Raised?
       The tunable should be increased by any customer if the customer's STREAMS module/driver(s) require a longer message size in the	data  por-
       tion than the current value.

   What Are the Side Effects of Raising the Value of This Tunable?
       The kernel will use more memory.  During low memory situations, it may bring down system performance due to frequent swapping.

   When Should the Value of This Tunable Be Lowered?
       The  tunable  could  be lowered by any customer if the customer's STREAMS module/driver(s) do not require a longer message size in the data
       portion than the current value.

   What Are the Side Effects of Lowering the Value of This Tunable?
       Possible improper functioning in any of the STREAMS module/driver(s).  Possible performance degradation, particularly in networking.

   What Other Tunable Should Be Changed at the Same Time as This One?
       None.

WARNINGS

       All HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases	of
       HP-UX.

       Installation  of  optional  kernel  software, from HP or other vendors, may cause changes to tunable parameter values.  After installation,
       some tunable parameters may no longer be at the default or recommended values.  For information about the effects of installation  on  tun-
       able  values,  consult  the documentation for the kernel software being installed.  For information about optional kernel software that was
       factory installed on your system, see at

AUTHOR

       was developed by HP.

							     Tunable Kernel Parameters						       STRMSGSZ(5)