Very Computer

        I have my machine connected to my University's network backbone
using an Ethernet card, and I want to give a friend of mine a PPP
connection. Here is the setup:

-       My friend is using a Mac in her room, and has MacTCP/MacPPP
        installed.

-       The University has special phone system, and modems cannot be
        used on them (ROLM). Instead, she uses the phone to connect to
        a central term-server, and telnets to my machine.

-       Once connected, she logs in as the PPP user, and quits the terminal
        program without* up. Then she starts MacPPP and it connects
        successfully.

-       I can see her from my machine as 'hunter.cif.rochester.edu' and
        can 'ping' the machine. She can also use NCSA telnet to connect to
        my machine using PPP.

        The problem is that she cannot connect to any other machines. And I
get no responce when I ping her machine from another machine. 'route' shows :

Kernel routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
localhost       *               255.255.255.255 UH    0      0        0 lo
hunter.cif.roch *               255.255.255.255 UH    0      0       72 ppp0
128.151.220.0   *               255.255.255.0   U     0      0        0 eth0
127.0.0.0       *               255.0.0.0       U     0      0        1 lo
default         cif-gw.utd.roch *               UG    0      0    11648 eth0

Here is the '/etc/ppp/ppplogin' file:

#!/bin/sh
exec /usr/etc/pppd passive netmask 255.255.255.0 silent proxyarp :128.151.220.68

And 'ifconfig' shows:

lo        Link encap Local Loopback  
          inet addr 127.0.0.1  Bcast 127.255.255.255  Mask 255.0.0.0
          UP BROADCAST LOOPBACK RUNNING  MTU 2000  Metric 1
          RX packets 0 errors 0 dropped 0 overruns 0
          TX packets 2 errors 0 dropped 0 overruns 0

ppp0      Link encap UNSPEC  HWaddr 00-00-00-00-00-00-00-F6-00-00-00-00-00-00-00-00
          inet addr 128.151.220.60  P-t-P 128.151.220.68  Mask 255.255.255.0
          UP POINTOPOINT RUNNING  MTU 1500  Metric 1
          RX packets 73 errors 0 dropped 0 overruns 0
          TX packets 72 errors 0 dropped 0 overruns 0

eth0      Link encap 10Mbps Ethernet  HWaddr 00:C0:93:01:00:AE
          inet addr 128.151.220.60  Bcast 128.151.220.255  Mask 255.255.255.0
          UP BROADCAST RUNNING  MTU 1500  Metric 1
          RX packets 12170 errors 0 dropped 0 overruns 0
          TX packets 11644 errors 0 dropped 0 overruns 0

        I guess I have to somehow make may machine act as the gateway for her
machine, but so far I have not been successful. I have the IP
Forwarding/Gatewaying option enabled in the kernel (1.1.76)

        Is there any way to fix the problem? I have been working whole day
today to find an answer, and I really need to get it done by tomorrow. ANy
suggestion would be greatly appreciated.

        Thank you very much in advance. Please send your replies to

        Regards,

        Rajib Rashid
        University of Rochester
--
         ___       Rajib Rashid : University of Rochester

        [`-']      CompuServe   : 73614,2406
        -"-"-      Web                : http://www.veryComputer.com/

:       I have my machine connected to my University's network backbone
: using an Ethernet card, and I want to give a friend of mine a PPP
: connection. Here is the setup:

: -     The University has special phone system, and modems cannot be
:       used on them (ROLM). Instead, she uses the phone to connect to
:       a central term-server, and telnets to my machine.

:       The problem is that she cannot connect to any other machines. And I
: get no responce when I ping her machine from another machine.

:       I guess I have to somehow make may machine act as the gateway for her
: machine, but so far I have not been successful. I have the IP
: Forwarding/Gatewaying option enabled in the kernel (1.1.76)

Would you please summarize and post any email responses you get? I've
been wrestling with almost exactly the same problem for quite some time
with no success. I've even tried compiling and installing gated, which so
far just seems to*things up worse. I have, though, been told that
this *is* possible to do (although nobody's offered to tell me how...)

--
       Mark A. Stevens, M.D.           Assistant Professor of Psychiatry

     Galveston, TX  77555-0428      |  Phone: (409) 772-3474

       Mark A. Stevens, M.D.           Assistant Professor of Psychiatry

     Galveston, TX  77555-0428      |  Phone: (409) 772-3474

1) issue the command 'arp -a' on the PPP dial-in host
   This will tell you what the physical ethernet address of the
   network-host interface is (in my case it's called le0).
   The reply you will get looks something like below (all names and
   addresses have been changed to protect the innocent!!):

Net to Media Table
Device   IP Address               Mask      Flags   Phys Addr
------ -------------------- --------------- ----- ---------------
le0    chester.anywhere.edu   255.255.255.255   SP    10:00:23:21:c7:ad
le0    BASE-ADDRESS.MCAST.NET 240.0.0.0       SM    01:00:8e:00:00:00

2) let's say that the ethernet address of the interface was
   10:00:23:21:c7:ad of the Dialin PPP host 'chester' and the name
   of the remote machine is 'buggles' (most stupid name I could think
   of!) then you now issue the following command

   arp -s buggles 10:00:23:21:c7:ad pub

3) bingo! you have told the network where it can send packets to when
   it's looking for the IP address of 'buggles' (the 'pub' bit at the
   end of the command publishes the address). This assumes that you have
   set up 'chester' as a router OK. Before doing this, I was able to
   connect through to the host machine, but not beyond....as soon as I
   issued the 'arp' command I got through everywhere.

This may not solve your problems, but it mught help.

Best wishes

Greg

Quote:>I had this problem until I 'linked' the IP address of the PPP remote
>to the ethernet address of the network interface of the dial in
>PPP machine host. eg.
>unless other machines on the network know the physical address of an
>IP, stuff won't get routed to it. what this involved for me (on a
>Solaris 2.4 machine) was to

Quote:>   arp -s buggles 10:00:23:21:c7:ad pub

        Any suggestions? Thank you very much in advance

        Rajib Rashid
        Univ of Rochester
--
         ___       Rajib Rashid : University of Rochester

        [`-']      CompuServe   : 73614,2406
        -"-"-      Web                : http://www.cif.rochester.edu/users/outcast/

cais.com:/pub/lvuong/inetv21.zip

Regards,

Linh Vuong
Core Systems

: >
: > :        I have my machine connected to my University's network backbone
: > : using an Ethernet card, and I want to give a friend of mine a PPP
: > : connection. Here is the setup:
: >
: > : -      The University has special phone system, and modems cannot be
: > :        used on them (ROLM). Instead, she uses the phone to connect to
: > :        a central term-server, and telnets to my machine.
: >
: > :        The problem is that she cannot connect to any other machines. And I
: > : get no responce when I ping her machine from another machine.
: >
: > :        I guess I have to somehow make may machine act as the gateway for her
: > : machine, but so far I have not been successful. I have the IP
: > : Forwarding/Gatewaying option enabled in the kernel (1.1.76)
: >
: > Would you please summarize and post any email responses you get? I've
: > been wrestling with almost exactly the same problem for quite some time
: > with no success. I've even tried compiling and installing gated, which so
: > far just seems to*things up worse. I have, though, been told that
: > this *is* possible to do (although nobody's offered to tell me how...)

: I had this problem until I 'linked' the IP address of the PPP remote
: to the ethernet address of the network interface of the dial in
: PPP machine host. eg.
: unless other machines on the network know the physical address of an
: IP, stuff won't get routed to it. what this involved for me (on a
: Solaris 2.4 machine) was to

: 1) issue the command 'arp -a' on the PPP dial-in host
:    This will tell you what the physical ethernet address of the
:    network-host interface is (in my case it's called le0).
:    The reply you will get looks something like below (all names and
:    addresses have been changed to protect the innocent!!):

: Net to Media Table
: Device   IP Address               Mask      Flags   Phys Addr
: ------ -------------------- --------------- ----- ---------------
: le0    chester.anywhere.edu   255.255.255.255   SP    10:00:23:21:c7:ad
: le0    BASE-ADDRESS.MCAST.NET 240.0.0.0       SM    01:00:8e:00:00:00

:
: 2) let's say that the ethernet address of the interface was
:    10:00:23:21:c7:ad of the Dialin PPP host 'chester' and the name
:    of the remote machine is 'buggles' (most stupid name I could think
:    of!) then you now issue the following command

:    arp -s buggles 10:00:23:21:c7:ad pub

: 3) bingo! you have told the network where it can send packets to when
:    it's looking for the IP address of 'buggles' (the 'pub' bit at the
:    end of the command publishes the address). This assumes that you have
:    set up 'chester' as a router OK. Before doing this, I was able to
:    connect through to the host machine, but not beyond....as soon as I
:    issued the 'arp' command I got through everywhere.

: This may not solve your problems, but it mught help.

: Best wishes

: Greg

--

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