PPP & ARP Proxy problems

PPP & ARP Proxy problems

Post by Vik Ollive » Mon, 11 Jan 1999 04:00:00



Well I've got as far as getting the Linux box logging in to my ISP via
PPP. Can run Netscape via a Win95 Xserver even, and Samba works too.

However, even though I've told my Win95 box that my Linux box is a
gateway, I can't access the web on the Win95 box (unless of course I
plug the modem into it directly, which spoils the point).

I do get some errors concering Proxy ARP in my message log:

Jan 11 12:52:45 hawk pppd[299]: pppd 2.3.3 started by root, uid 0
Jan 11 12:53:17 hawk pppd[299]: Serial connection established.
Jan 11 12:53:18 hawk pppd[299]: Using interface ppp0
Jan 11 12:53:18 hawk pppd[299]: Connect: ppp0 <--> /dev/ttyS0
Jan 11 12:53:19 hawk pppd[299]: Warning - secret file
/etc/ppp/pap-secrets has w
orld and/or group access
Jan 11 12:53:20 hawk pppd[299]: proc file system not mounted
Jan 11 12:53:20 hawk pppd[299]: Cannot determine ethernet address for
proxy ARP
Jan 11 12:53:20 hawk pppd[299]: local  IP address 209.78.51.111
Jan 11 12:53:20 hawk pppd[299]: remote IP address 203.29.165.44

I've been through the Masquerade and PPP HOWTOs with no luck, and even
scoured the dejanews comp.os.linux archive. If someone can help me with
suggesting where I'm fouling things up, I'd appreciate it. I'll even
update the FAQ!

Vik :v)

 
 
 

PPP & ARP Proxy problems

Post by Wim Mee » Thu, 14 Jan 1999 04:00:00




: > However, even though I've told my Win95 box that my Linux box is a
: > gateway, I can't access the web on the Win95 box (unless of course I
: > plug the modem into it directly, which spoils the point).
[...]
: > Jan 11 12:53:20 hawk pppd[299]: Cannot determine ethernet address for
: > proxy ARP
: may be fixed by above.
Don't think so, proxyarp is an option that should be commented away in
/etc/ppp/options . You only need this option if the remote IP address
(remote side of the ppp link) is in the same subnet as the local lan IP
(ethernet). This is (almost) never the case with masquerading.

Wim.

--
-----------------------------------       -----------------------------------
  To err is human.                                                Wim Meeus
  To really f**k things up,

-----------------------------------       -----------------------------------

 
 
 

1. Proxy Arp on SLIP/PPP server is giving me problems

A week or three ago, I set up a box with Linux 1.2.1 to be a terminal
server for shell logins, PPP and SLIP.  Shell logins work fine
to a Sparc running Solaris 2.3.   PPP and SLIP are set up in the
conventional way, doing proxy-arp in order to route packets to the
dial-in connection.  This is set up the same way I have done other
servers (which work fine).

However in this case, even though an arp -a shows the correct published
arp entries, the Solaris machine and the Dec Brouter running Cisco
software which is the link to the Internet never show corresponding
entries in their arp tables no matter how many pings are used.

Communications directly from the Linux server work perfectly, it is
just the proxy-arp done for dial-in SLIP and PPP which fails.  
Different network cards have been tried.

I have resorted to hard coding arp entries to get customers working,
but want to get this sorted out.

Has anyone seen something like this?  Is this a known problem fixed in
one of the 1.2.2-11 kernels?

Regards,
Richard Haakma.

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