RE: proxy arp and MPD in RELENG_8

The patch is now available at

	http://people.freebsd.org/~qingli/PPP-Patch-2.diff

You need to rebuild the kernel as well as the userland 
"arp" utility.  

I have performed various but limited unit testing, including
simulating the reported PPP issue. The patch appears to be
doing what it supports to.  

Please give it a try and report back. Thanks,

-- Qing


> -----Original Message-----
> From: Li, Qing
> Sent: Thursday, December 10, 2009 10:31 PM
> To: Li, Qing; Mario Pavlov; freebsd-stable_at_freebsd.org; freebsd-
> current_at_freebsd.org
> Subject: RE: proxy arp and MPD in RELENG_8
> 
> Hi,
> 
> I think I managed to reproduce this issue. The root cause appears
> to be the SIN_PROXY usage, which is no longer part of any routing
> entry after the L2/L3 rewrite. As such, the RTM_GET command
> should be issued once in the ARP utility, not twice.
> 
> In addition, since ARP does not apply to PPP link type, the
> prefix route of the local end point needs to be returned
> in order for the subsequent RTM_ADD command to succeed.
> I need to update the routing code a bit more to properly
> handle such proxy-arp scenario.
> 
> In the meantime, please try a hack at
> 
> 	http://people.freebsd.org/~qingli/ppp-patch.diff
> 
> and let me know how it works out for you. The hack appears
> to work in my test environment.
> 
> I need just a bit more time to work out the permanent
> solution in the kernel routing code, as well as the
> utilities in the userland.
> 
> -- Qing
> 
> 
> > -----Original Message-----
> > From: owner-freebsd-current_at_freebsd.org [mailto:owner-freebsd-
> > current_at_freebsd.org] On Behalf Of Li, Qing
> > Sent: Wednesday, December 09, 2009 12:04 PM
> > To: Mario Pavlov; freebsd-stable_at_freebsd.org; freebsd-
> > current_at_freebsd.org
> > Subject: RE: proxy arp and MPD in RELENG_8
> >
> >
> > Let me look into this issue and work with you offline.
> >
> > I have been quite busy with day job and just starting to slowly
> > resume my FreeBSD work.
> >
> > -- Qing
> >
> >
> > -----Original Message-----
> > From: owner-freebsd-stable_at_freebsd.org on behalf of Mario Pavlov
> > Sent: Wed 12/9/2009 11:01 AM
> > To: freebsd-stable_at_freebsd.org; freebsd-current_at_freebsd.org
> > Subject: proxy arp and MPD in RELENG_8
> >
> >
> >  Hi,
> > some time ago I noticed that there's a problem with the new arp
> > implementation - proxy arp was somehow not working when mpd is
> involved.
> > I decided to try this out again assuming it was fixed for the
> > release...unfortunately the problem is still there...
> > Here are the last few lines of the mpd output:
> >
> >
> > [B-1] IPCP: state change Ack-Rcvd --> Opened
> > [B-1] IPCP: LayerUp
> > [B-1]   192.168.10.1 -> 192.168.10.50
> > [B-1] IFACE: Connecting tcpmssfix
> > [B-1] IFACE: Add address 192.168.10.1/32->192.168.10.50 to ng0
> > [B-1] exec: /usr/sbin/arp -S 192.168.10.50 0:e0:28:62:e:9 pub
> > [B-1] system: command "/usr/sbin/arp" returned 256
> > [B-1] IFACE: Up event
> > [B-1] IFACE: idle-timeout: 1800 seconds
> > [B-1] IFACE: Change interface flags: -0 +1
> >
> >
> > there this is mpd.conf:
> >
> >
> > startup:
> >
> > default:
> >         load pptp_server
> >
> > pptp_server:
> >
> >         set ippool add pool1 192.168.10.50 192.168.10.99
> >
> >         create bundle template B
> >         set iface enable proxy-arp
> >         log +iface2
> >         set iface idle 1800
> >         set iface enable tcpmssfix
> >         set ipcp yes vjcomp
> >         set ipcp ranges 192.168.10.1/32 ippool pool1
> >         set ipcp dns 192.168.10.1
> >         set bundle enable compression
> >         set ccp yes mppc
> >         set mppc yes e40
> >         set mppc yes e128
> >         set mppc yes stateless
> >
> >         create link template L pptp
> >         set link action bundle B
> >         set link enable multilink
> >         set link yes acfcomp protocomp
> >         set link no pap chap
> >         set link enable chap
> >         set link keep-alive 10 60
> >         set link mtu 1460
> >         set pptp self pub.ip.add.res
> >         set link enable incoming
> >
> >
> > this is probably the most common VPN setup and it was working fine
> with
> > 7.2-STABLE but after I upgraded to 8-STABLE it broke up...
> > Is there a workaround or a plan to fix this? Or should I just go
back
> > to RELENG_7?
> >
> > thank you.
> >
> > P.S. this is discussed in the forums as well:
> > http://forums.freebsd.org/showthread.php?t=8427
> >
> > -----------------------------------------------------------------
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