Date: Thu, 18 Dec 2008 17:41:02 -0800 From: "Li, Qing" <qing.li@bluecoat.com> To: "current" <current@freebsd.org> Cc: Joe Marcus Clarke <marcus@freebsd.org> Subject: RE: NAT (ipfw/natd) broken in latest -CURRENT Message-ID: <B583FBF374231F4A89607B4D08578A4302A26E8C@bcs-mail03.internal.cacheflow.com> In-Reply-To: <1229637745.60337.62.camel@shumai.marcuscom.com> References: <1229476796.49670.7.camel@shumai.marcuscom.com> <B583FBF374231F4A89607B4D08578A4302A26B5F@bcs-mail03.internal.cacheflow.com> <1229637745.60337.62.camel@shumai.marcuscom.com>
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I have checked in a fix for this issue (r186308), which turned out to=20 be a problem in the ppp module. The ppp module updates the p2p host=20 route that was installed during the tunnel configuration, however, the=20 ppp code always set the RTF_GATEWAY flag. The patch has been verified to be working by Joe. Please let me know if you run into any other issue. Thanks, -- Qing > -----Original Message----- > From: Joe Marcus Clarke [mailto:marcus@freebsd.org] > Sent: Thursday, December 18, 2008 2:02 PM > To: Li, Qing > Cc: current > Subject: RE: NAT (ipfw/natd) broken in latest -CURRENT >=20 > On Thu, 2008-12-18 at 12:53 -0800, Li, Qing wrote: > > Hi Joe, > > > > I have been trying to recreate your problem but my setup seem to > > work. I then noticed in your original netstat output the p2p > > host route installed by the tunnel interface has the "G" flag > > set. This will certainly cause a routing problem because that > > route is not an indirect route. I modified the kernel code to > simulate > > this condition and I do see the error on output, which is expected. > > > > I assume this problem is consistently reproducible in your setup ? >=20 > Absolutely. Every time I setup the p2p tunnel with the non-proxy ARP > address range. Traffic flows outbound, but never inbound. Your > analysis sounds correct. The kernel doesn't know the interface on > which > to encapsulate the return traffic. >=20 > Joe >=20 > > > > -- Qing > > > > > > > -----Original Message----- > > > From: owner-freebsd-current@freebsd.org [mailto:owner-freebsd- > > > current@freebsd.org] On Behalf Of Joe Marcus Clarke > > > Sent: Tuesday, December 16, 2008 5:20 PM > > > To: current > > > Subject: NAT (ipfw/natd) broken in latest -CURRENT > > > > > > I just upgraded my i386 -CURRENT box from November 14 to today, and > > now > > > my SSH-over-PPP VPN tunnel no longer works. I did some packet > > captures, > > > and it appears that NAT is no longer working. If I send a telnet > > > packet > > > from my client side over the PPP tunnel, I see the SYN go out on > the > > > server side network properly translated. The destination host ACKs > > > correctly, but the ACK never goes back across the tunnel. It's as > if > > > natd is no longer translating the packet on the inbound path. > Besides > > > the upgrade, nothing has changed in my environment. > > > > > > My ipfw show looks like: > > > > > > 00050 22974 4677637 divert 8668 ip4 from any to any via em0 > > > 00100 194 20696 allow ip from any to any via lo0 > > > 00200 0 0 deny ip from any to 127.0.0.0/8 > > > 00300 0 0 deny ip from 127.0.0.0/8 to any > > > 65000 24714 4934785 allow ip from any to any > > > 65535 5 396 deny ip from any to any > > > > > > I am running natd as: > > > > > > /sbin/natd -s -m -skinny_port 2000 -n em0 > > > > > > The ifconfig for my tunnel interface is: > > > > > > tun0: flags=3D8051<UP,POINTOPOINT,RUNNING,MULTICAST> metric 0 mtu > 1300 > > > inet 10.1.1.1 --> 10.1.1.76 netmask 0xffffff00 > > > inet6 fe80::211:11ff:fe10:461e%tun0 prefixlen 64 scopeid 0x5 > > > Opened by PID 8018 > > > > > > My netstat on the server side looks like: > > > > > > Internet: > > > Destination Gateway Flags Refs Use Netif > > > Expire > > > default 172.18.254.1 UGS 0 46685 em0 > > > 10.1.1.76 link#5 UGH 0 1735 tun0 > > > 127.0.0.1 link#3 UH 0 1171 lo0 > > > 172.18.254.0/24 link#1 U 0 0 em0 > > > 172.18.254.237/32 link#1 U 0 8 em0 > > > > > > The server's uname is: > > > > > > FreeBSD jclarke-pc.cisco.com 8.0-CURRENT FreeBSD 8.0-CURRENT #130: > Tue > > > Dec 16 15:42:09 EST 2008 > > > marcus@jclarke-pc.cisco.com:/usr/obj/usr/src/sys/JCLARKE-PC i386 > > > > > > The previous, working uname was: > > > > > > FreeBSD 8.0-CURRENT #129: Fri Nov 14 13:51:50 EST 2008 > > > marcus@jclarke-pc.cisco.com:/usr/obj/usr/src/sys/JCLARKE-PC > > > > > > Joe > > > > > > -- > > > Joe Marcus Clarke > > > FreeBSD GNOME Team :: gnome@FreeBSD.org > > > FreeNode / #freebsd-gnome > > > http://www.FreeBSD.org/gnome > > > -- > Joe Marcus Clarke > FreeBSD GNOME Team :: gnome@FreeBSD.org > FreeNode / #freebsd-gnome > http://www.FreeBSD.org/gnome
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