Khapare Joshi | 3 Feb 00:39 2012
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pptpd is absolute ?

is pptp absolute ?

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James Cameron | 3 Feb 01:10 2012

Re: pptpd is absolute ?

On Thu, Feb 02, 2012 at 11:39:48PM +0000, Khapare Joshi wrote:
> is pptp absolute ?

There are so many meanings of the word absolute.

Taking a guide from Wiktionary ... I shall answer each meaning:

Wiktionary says:
> Loosed from any limitation or condition; uncontrolled; unrestricted;
> unconditional; as, absolute authority, monarchy, sovereignty, an
> absolute promise or command.

pptpd and pptp on Linux are open source, licensed under the GNU GPL.

The protocol PPTP is defined in an IETF RFC.

The protocol is, nowadays, easily subverted and controlled by hostile
attacker.

> Complete in itself; perfect; consummate; faultless.

No.

> Viewed apart from modifying influences or without comparison with
> other objects; actual; real; - opposed to relative and comparative;
> as, absolute motion; absolute time or space.

No.

> Loosed from, or unconnected by, dependence on any other being;
> self-existent; self-sufficing.

No.

> Capable of being thought or conceived by itself alone; unconditioned;
> non-relative.

No.

> (rare) Positive; clear; certain; not doubtful.

No.

> (rare) Authoritative; peremptory. 

No.

> (chemistry) Pure; unmixed; as, absolute alcohol.

Not applicable.

> (grammar) Not immediately dependent on the other parts of the sentence
> in government; as, the case absolute. (See ablative absolute.)

Not applicable.

--

-- 
James Cameron
http://quozl.linux.org.au/

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Tobias Skytte | 8 Feb 19:59 2012
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(no subject)


http://sweetcats.ic.cz/vet/206792.html

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Mathew Benson | 22 Feb 20:53 2012
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Configuration help

I'm trying to use poptop to access a virtual machine and was hoping
somebody could help me understand what I need to do.

My virtual machine is running on linux in a proprietary engine thats
beyond my control.  The IP it uses to talk to the outside world is a
private 172.16 address, but I can specify that it either bind to a
physical interface or bridge to a TAP.  I prefer the TAP because it
keeps the low bandwidth VM traffic off my high bandwidth NIC.  I
installed poptop on CentOS 5 with yum, configured my Windows 7 box to
connect to it, and that seems to work.  At least it authenticates and
I can see traffic from my client to the server on Wireshark.

When I try to ssh from the client side into any 172.16.xxx.xxx, I see
the packets on the server side on interface ppp0.  When I try sending
packets from the server to the client, using the address that pptpd
gave it, I get nothing.  Debugging is compounding because I don't see
the VPN interface in Wireshark on Windows.  Only Linux.  So, I
installed a web server on the windows side, and tried viewing it from
the Linux side.  But nothing.  It appears traffic only goes 1 way:
client to the server.

Why can't the server send data to the client?

ifconfig output:

eth0      Link encap:Ethernet  HWaddr xx:xx:xx:xx:xx:xx
          inet addr:xxx.xxx.xxx.xxx  Bcast:xxx.xxx.xxx.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1504748 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2205475 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:283177506 (270.0 MiB)  TX bytes:2156819895 (2.0 GiB)
          Interrupt:233 Memory:ea000000-ea012800

ppp0      Link encap:Point-to-Point Protocol
          inet addr:172.16.0.81  P-t-P:172.16.168.1  Mask:255.255.255.255
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1396  Metric:1
          RX packets:30 errors:0 dropped:0 overruns:0 frame:0
          TX packets:129 errors:0 dropped:20 overruns:0 carrier:0
          collisions:0 txqueuelen:3
          RX bytes:1964 (1.9 KiB)  TX bytes:9300 (9.0 KiB)

route output:
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
172.16.168.1    *               255.255.255.255 UH    0      0        0 ppp0
xxx.xxx.xxx.0    *               255.255.255.0 U    0      0        0 eth0

/etc/pptpd.conf

###############################################################################
# $Id: pptpd.conf,v 1.10 2006/09/04 23:30:57 quozl Exp $
#
# Sample Poptop configuration file /etc/pptpd.conf
#
# Changes are effective when pptpd is restarted.
###############################################################################

# TAG: ppp
#	Path to the pppd program, default '/usr/sbin/pppd' on Linux
#
#ppp /usr/sbin/pppd

# TAG: option
#	Specifies the location of the PPP options file.
#	By default PPP looks in '/etc/ppp/options'
#
option /etc/ppp/options.pptpd

# TAG: debug
#	Turns on (more) debugging to syslog
#
#debug

# TAG: stimeout
#	Specifies timeout (in seconds) on starting ctrl connection
#
# stimeout 10

# TAG: noipparam
#       Suppress the passing of the client's IP address to PPP, which is
#       done by default otherwise.
#
#noipparam

# TAG: logwtmp
#	Use wtmp(5) to record client connections and disconnections.
#
logwtmp

# TAG: bcrelay <if>
#	Turns on broadcast relay to clients from interface <if>
#
#bcrelay eth1

# TAG: delegate
#	Delegates the allocation of client IP addresses to pppd.
#
#       Without this option, which is the default, pptpd manages the list of
#       IP addresses for clients and passes the next free address to pppd.
#       With this option, pptpd does not pass an address, and so pppd may use
#       radius or chap-secrets to allocate an address.
#
#delegate

# TAG: connections
#       Limits the number of client connections that may be accepted.
#
#       If pptpd is allocating IP addresses (e.g. delegate is not
#       used) then the number of connections is also limited by the
#       remoteip option.  The default is 100.
#connections 100

# TAG: localip
# TAG: remoteip
#	Specifies the local and remote IP address ranges.
#
#	These options are ignored if delegate option is set.
#
#       Any addresses work as long as the local machine takes care of the
#       routing.  But if you want to use MS-Windows networking, you should
#       use IP addresses out of the LAN address space and use the proxyarp
#       option in the pppd options file, or run bcrelay.
#
#	You can specify single IP addresses seperated by commas or you can
#	specify ranges, or both. For example:
#
#		192.168.0.234,192.168.0.245-249,192.168.0.254
#
#	IMPORTANT RESTRICTIONS:
#
#	1. No spaces are permitted between commas or within addresses.
#
#	2. If you give more IP addresses than the value of connections,
#	   it will start at the beginning of the list and go until it
#	   gets connections IPs.  Others will be ignored.
#
#	3. No shortcuts in ranges! ie. 234-8 does not mean 234 to 238,
#	   you must type 234-238 if you mean this.
#
#	4. If you give a single localIP, that's ok - all local IPs will
#	   be set to the given one. You MUST still give at least one remote
#	   IP for each simultaneous client.
#
# (Recommended)
localip 172.16.0.81
remoteip 172.16.168.1-254
# or
#localip 192.168.0.234-238,192.168.0.245
#remoteip 192.168.1.234-238,192.168.1.245

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