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[Openvpn-users] sendmail books


  • Subject: [Openvpn-users] sendmail books
  • From: "Chris Baker" <cbaker@xxxxxxxxxxxxxxxxxxx>
  • Date: Tue, 6 Jan 2004 13:53:24 -0500
  • Importance: Normal

Does anyone have a recommendation on a good Sendmail book?

Thanks.

====================================================
Chris Baker -- technical specialist
614-839-2447x108
cbaker@xxxxxxxxxxxxxxxxxxx
www.bbbscentralohio.org
Big Brothers Big Sisters of Central Ohio
Opinions expressed in this e-mail are solely my own.

The document(s) accompanying or within this email transmission may contain
confidential information belonging to Big Brothers Big Sisters of Central
Ohio, which is legally privileged for the entity named above.  If you are
not the intended recipient, you are hereby cautioned that any disclosure,
copying, distribution, or the taking of any action in reliance on the
contents of this email information is strictly prohibited.  If you receive
this email in error, please notify us immediately by fax (614-839-5437) or
phone (614-839-2447) to advise of the error.

-----Original Message-----
From: openvpn-users-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:openvpn-users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of John Locke
Sent: Monday, January 05, 2004 2:06 PM
To: Doug Lytle
Cc: openvpn-users@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [Openvpn-users] Multiple Windows clients to a Linux server

On Mon, 2004-01-05 at 10:51, Doug Lytle wrote:
> I don't know, I set out to route. 
> 
> I've gotten a couple complaints of how this wastes address space, so 
> I've talked to our network administrator and asked if there was a way to 
> reduce the waste of the address space.  He said I could use a 
> 255.255.255.252 subnet mask:
> 
I did this for the tun devices I set up. In the docs, it says that
Windows tun devices must use a subnet with a 255.255.255.252 subnet,
using the middle pair of addresses. Haven't tested this from Windows,
though.

I used a private VPN address space of 10.192.0.0/30 for these devices,
because it seems almost all of the home broadband devices use a
192.168.* subnet, and I thought I would completely eliminate a chance of
conflicts by using something away from that. Of course, if you use a
10.0.0.0/8 private network, this won't work...

For assigning the actual addresses, this level of subnet made for an
easy formula for determining the correct IP address:

- for the server side, take the tun device number, multiply by 4, and
add 1. tun0 = 10.192.0.1, tun1 = 10.192.0.5, tun2 = 10.192.0.9, etc.

- for the client side, take the tun device number, multiply by 4, and
add 2. remote connection for tun0 = 10.192.0.2, tun1 = 10.192.0.6, tun2
= 10.192.0.10.

Add a return route to the main router, directing 10.192.0.0/24 to the
openvpn gateway, and you're in business.

Is there an advantage to using tap devices in a routed configuration?
-- 
John Locke
Open Source solutions for small business problems
http://freelock.com


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