[pptp-server] "proxyarp" or " route"

Wed Dec 6 21:17:55 CST 2000

Hi:
   Thank u for help.
   I know "proxyarp" run on the server side(PPTPD) .  I had thought  it was
PPP client side
IP address (in PPTP say remote IP ) should be proxyarp-ed  out by PPTP
server .But actually
the local IP address was proxyarp-ed out. So another computer on Lan can't
get an arp reply of
PPTP remote IP address .

Dec  7 10:22:43 linux pptpd[4869]: CTRL: Client x.x.x.82 control connection
started
Dec  7 10:22:43 linux pptpd[4869]: CTRL: Starting call (launching pppd,
openingGRE)
Dec  7 10:22:43 linux modprobe: modprobe: Can't locate module char-major-108
Dec  7 10:22:43 linux kernel: CSLIP: code copyright 1989 Regents of the
University of California
Dec  7 10:22:43 linux kernel: PPP: version 2.3.7 (demand dialling)
Dec  7 10:22:43 linux kernel: PPP line discipline registered.
Dec  7 10:22:43 linux kernel: registered device ppp0
Dec  7 10:22:43 linux pptpd[4869]: GRE: Discarding duplicate packet
Dec  7 10:22:43 linux pppd[4870]: pppd 2.3.10 started by root, uid 0
Dec  7 10:22:43 linux pppd[4870]: Using interface ppp0
Dec  7 10:22:43 linux pppd[4870]: Connect: ppp0 <--> /dev/pts/2
Dec  7 10:22:45 linux pptpd[4869]: CTRL: Ignored a SET LINK INFO packet with
real ACCMs!
Dec  7 10:22:46 linux kernel: PPP BSD Compression module registered
Dec  7 10:22:46 linux kernel: PPP Deflate Compression module registered
Dec  7 10:22:46 linux pppd[4870]: CHAP peer authentication succeeded for
billy
Dec  7 10:22:46 linux pppd[4870]: found interface eth0 for proxy arp
Dec  7 10:22:46 linux pppd[4870]: local  IP address x.x.x.221
Dec  7 10:22:46 linux pppd[4870]: remote IP address x.x.x.231

So ping x.x.x.221 is accessable from x.x.x.99
ping x.x.x.231 is not accessable form x.x.x.99

----- Original Message -----
From: "George Vieira" <georgev at citadelcomputer.com.au>
To: "'Zhu Xiaofeng'" <xfzhu at seu.edu.cn>
Cc: "PPTP List (E-mail)" <pptp-server at lists.schulte.org>
Sent: Wednesday, December 06, 2000 5:00 PM
Subject: RE: [pptp-server] "proxyarp" or " route"

> proxyarp should be running on the server side (PPTPD).
> Can the (x.x.x.1) client ping x.x.x.2 OK as well as x.x.x.3 . Or does it
> ping only the .2 server?
>
> Your logs should also mention about proxyarp attaching to the ETH0/1/2
> device. eg.
> <var_log_messages>
> "Dec  4 06:43:27 linuxdev pppd[24131]: found interface eth0 for proxy arp"
> </var_log_messages>
>
> This means that proxy arp is using the local ETH0 device to listen for
> requests to x.x.x.1
>
> Can you sent us some logs on the server side.
>
> -----Original Message-----
> From: Zhu Xiaofeng [mailto:xfzhu at seu.edu.cn]
> Sent: Wednesday, December 06, 2000 6:02 PM
> To: George Vieira
> Cc: PPTP List (E-mail)
> Subject: Re: [pptp-server] "proxyarp" or " route"
>
>
> My question is :
> When PPTP client connect to PPTP(PoPToP) server , it set up a ppp
connection
> between Server and Client . And Client get an IP for PPP client side
> and Server get an IP for PPP server side .
> Is it the PPP client side IP address "proxyarp"
> or the PPP server side IP address "proxyarp"?
>
>             Client <-------PPP OVER PPTP--------> SERVER
>             x.x.x.1                                x.x.x.2
> Though on x.x.x.3 ping x.x.x.1 and x.x.x.2:
> x.x.x.1 is not accessable
> x.x.x.2 is accessable.
>
> But when I use Microsoft PPTP server , the result is   on the contrary.
>
> I use sniffer to watch  IP data .It didn't seem that ARP reply  was sent
out
> as what I had thought by PoPToP SERVER .
>
> ----- Original Message -----
> From: "George Vieira" <georgev at citadelcomputer.com.au>
> To: "'Zhu Xiaofeng'" <xfzhu at seu.edu.cn>
> Cc: "PPTP List (E-mail)" <pptp-server at lists.schulte.org>
> Sent: Tuesday, December 05, 2000 11:43 AM
> Subject: RE: [pptp-server] "proxyarp" or " route"
>
>
> > I think you need IP forwarding (Not IP masquerading) turned on..
> >
> > Have your got any IPCHAINS rules turned on which might be killing it?
> > Can you use tcpdump to determine where the pings are going?
> >
> >
> > -----Original Message-----
> > From: Zhu Xiaofeng [mailto:xfzhu at seu.edu.cn]
> > Sent: Tuesday, December 05, 2000 1:55 PM
> > To: pptp-server at lists.schulte.org
> > Subject: [pptp-server] "proxyarp" or " route"
> >
> >
> > Hi everyone:
> >
> >    I setup PoPToP 1.0.0 on my Turbo linux 6.0 . My network configuration
> is
> > following:
> >
> >          PoPToP server          cisco router
> >           x.x.24.198   <-------->  x.x.24.1 <----> real Internet
> >               |
> >               |
> >               |
> >          win2000
> >          x.x.24.99
> >
> > /etc/ppp/options
> >
> > debug
> > name linux
> > auth
> > require-chap
> > proxyarp
> >
> > /etc/pptpd.conf
> >
> > option /etc/ppp/options
> > debug
> > speed 115200
> > localip x.x.24.220-229
> > remoteip x.x.24.230-239
> >
> >  My idea is to let x.x.24.99 dial on x.x.24.198 via PPTP to access real
> > Internet.
> > All address are real IP addresses.I don't think it need NAT or IP MASQE
> .Is
> > it OK?
> > Should I do more configration on x.x.24.198 ?
> >
> >   When I dial up from x.x.24.99 to  x.x.24.198 ,win2000 get PPP client
> > address x.x.24.230 and PPP
> > server address is x.x.24.220 . Ping x.x.24.230 is not accessable but
> > x.x.24.220 is accessable from other
> > computer x.x.24.200 .I don't know much about "proxyarp",but I think it
is
> > x.x.24.230 that can be accessable.
> > Why?
> >
> >
> > xfzhu.
> >
> >
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