[pptp-server] PopTop Problem

George R. Kasica georgek at netwrx1.com
Wed Sep 29 15:34:47 CDT 1999


Sorry to bug you with this but I need to get it working soon and have
had no success....

George

Well, I've got pptpd 1.0 working well here, with a small problem.....I
still seem to send all data down the "normal" channel be it dialup or
ethernet connect rather than everything over the VPN....this causes
the problem that I still appear to come to the ISPs news server from
"outside" their network....how to I accomplish the following (the
Client is WIN98 Server with pptpd on it Linux 2.2.5) IP Addresses are
REAL there is no firewall between:

Client					Server		 ISP
205.254.202.120	-----  VPN ------------ 205.254.202.114 - 156.46.10.23
10.36.9.242 --------- INTERNET--------->

I'm getting the VPN Adapter assigned the IP address above yet the
traffic when trace routed seems to go through the 'Net rather than
routing through the Server hence the problem with appearing from
"outside" the net.

Any suggestions, and please keep it simple and as clear as possible.

>your route table may be sending the packets in a direction you may not have
>expected. print our yout route table and i'll have a look
>
>-matt
>
Matt:

Here it is in "steps"

1) Just ethernet connected, no dialup or VPN (cannot get out to
Internet from here) Ethernet info 3.231.4.237 255.255.252.0

C:\WINDOWS\Desktop>route print

Active Routes:

  Network Address          Netmask  Gateway Address        Interface
Metric
          0.0.0.0          0.0.0.0      3.231.4.254      3.231.4.237
1
        3.231.4.0    255.255.252.0      3.231.4.237      3.231.4.237
1
      3.231.4.237  255.255.255.255        127.0.0.1        127.0.0.1
1
    3.255.255.255  255.255.255.255      3.231.4.237      3.231.4.237
1
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1
1
        224.0.0.0        224.0.0.0      3.231.4.237      3.231.4.237
1
  255.255.255.255  255.255.255.255      3.231.4.237          0.0.0.0
1


2) Dialup Connection with Ethernet
Info Ethernet 3.231.4.237 255.255.252.0
Dialup: 208.254.238.104 255.255.255.255 Internet goes through here.

Active Routes:

  Network Address          Netmask  Gateway Address        Interface
Metric
          0.0.0.0          0.0.0.0      3.231.4.254      3.231.4.237
2
          0.0.0.0          0.0.0.0  208.254.238.104  208.254.238.104
1
        3.231.4.0    255.255.252.0      3.231.4.237      3.231.4.237
2
      3.231.4.237  255.255.255.255        127.0.0.1        127.0.0.1
1
    3.255.255.255  255.255.255.255      3.231.4.237      3.231.4.237
1
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1
1
    208.254.238.0    255.255.255.0  208.254.238.104  208.254.238.104
1
  208.254.238.104  255.255.255.255        127.0.0.1        127.0.0.1
1
        224.0.0.0        224.0.0.0      3.231.4.237      3.231.4.237
1
        224.0.0.0        224.0.0.0  208.254.238.104  208.254.238.104
1
  255.255.255.255  255.255.255.255  208.254.238.104  208.254.238.104
1


3) Ethernet with dialup and VPN Active:
Info Ethernet 3.231.4.237 255.255.252.0
Dialup: 208.254.238.104 255.255.255.255 Internet goes through here.
VPN: 205.254.202.120 255.255.255.0

Active Routes:

  Network Address          Netmask  Gateway Address        Interface
Metric
          0.0.0.0          0.0.0.0      3.231.4.254      3.231.4.237
2
          0.0.0.0          0.0.0.0  208.254.238.104  208.254.238.104
1
        3.231.4.0    255.255.252.0      3.231.4.237      3.231.4.237
2
      3.231.4.237  255.255.255.255        127.0.0.1        127.0.0.1
1
    3.255.255.255  255.255.255.255      3.231.4.237      3.231.4.237
1
        127.0.0.0        255.0.0.0        127.0.0.1        127.0.0.1
1
    205.254.202.0    255.255.255.0  205.254.202.120  205.254.202.120
1
  205.254.202.114  255.255.255.255  208.254.238.104  208.254.238.104
1
  205.254.202.120  255.255.255.255        127.0.0.1        127.0.0.1
1
    208.254.238.0    255.255.255.0  208.254.238.104  208.254.238.104
1
  208.254.238.104  255.255.255.255        127.0.0.1        127.0.0.1
1
        224.0.0.0        224.0.0.0      3.231.4.237      3.231.4.237
1
        224.0.0.0        224.0.0.0  208.254.238.104  208.254.238.104
1
        224.0.0.0        224.0.0.0  205.254.202.120  205.254.202.120
1
  255.255.255.255  255.255.255.255  208.254.238.104  208.254.238.104
1

A trace route to news.alpha.net (156.46.10.23) shows:

Trace news.alpha.net; Start time 09/24/99 09:23:42
Tracing route to 156.46.10.23
50 bytes from 156.46.10.23: time=175 ms
Hop         Avg          Diff           Address
1           	104         	104         	206.115.150.210
tnt18.chi5.da.uu.net
2           	102         	-5          	207.76.46.206
3           	99          	-5          	152.63.64.22
132.ATM11-0-0.HR2.CHI1.ALTER.NET
4           	103         	2           	146.188.208.46
103.ATM3-0.XR2.CHI4.ALTER.NET
5           	102         	1           	146.188.208.13
194.ATM9-0-0.BR1.CHI1.ALTER.NET
6           	123         	21          	137.39.250.6
gw14-chi-8-0.sprintlink.net
7           	103         	-11         	144.232.10.157
sl-bb11-chi-2-1.sprintlink.net
8           	104         	1           	144.232.0.202
sl-gw16-chi-8-0-0.sprintlink.net
9           	762         	660         	144.228.207.18
sl-alphadot-2-1-0.sprintlink.net
10          	145         	-299        	206.190.31.9
core51-h-1-0.mke.alpha.net
11          	198         	50          	156.46.10.23
news.alpha.net
End time 09/24/99 09:24:10
host reached

But it does NOT go through the PPTP Server eagle.netwrx1.net
(205.254.202.114) (thats a one not an L)

If you'd like to try testing you can use the login of georgek and
password of tibbs1 (thats a one not an L)

Here is the netstat -nr from the PPTP Server:

[root at eagle /root]# netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window
irtt Iface
205.254.202.120 0.0.0.0         255.255.255.255 UH        0 0
0 ppp0
192.168.1.0     0.0.0.0         255.255.255.240 U         0 0
0 eth0
205.254.202.112 0.0.0.0         255.255.255.240 U         0 0
0 eth0
127.0.0.0       0.0.0.0         255.0.0.0       U         0 0
0 lo
0.0.0.0         205.254.202.113 0.0.0.0         UG        0 0
0 eth0  





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