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[Xen-users] (vif-route) DomU IP troubles beyond Dom0

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] (vif-route) DomU IP troubles beyond Dom0
From: Piers Dawson-Damer <piersdd@xxxxxxxxxxxxx>
Date: Sat, 1 Apr 2006 02:07:31 +1100
Delivery-date: Mon, 03 Apr 2006 09:50:44 -0700
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Hello All,
 Having read these posts over and over again I find myself in the same position as many with DomU routing.
 Trying to keep the configuration as simple (default) as possible, I have tried what feels like every permutation of configuration. 

It would be great if somebody could confirm/clear up this for me; (from http://wiki.xensource.com/xenwiki/XenNetworking)
When domU starts up, xend runs (within dom0) vif-route which:
   1.      copies the ip address from eth0 to vif<id#>.0 (with a 32 bit subnet mask 255.255.255.255)
   2.      brings up vif<id#>.0 (which seams to be on a different subnet, but there really are no subnets with 32 bit masks)
   3.      adds host static route for domU's ip address specified in domU config file, pointing at interface 
(which relies on proxyarp)
So, is proxyARP essential for routing with point-to-point 32 bit mask links, or only Xen routing?

With a configured DomU on a seperate subnet to Dom0's eth0, with vif ['ip=10.9.0.1'] and with Dom0's default route set to dev eth0
DomU can ping Dom0 on 10.1.0.254/16, but cannot ping real host 10.1.0.253/16 (DSL masq. router) on the same physical/logical network. Nor two other MacOS X hosts, but get this, it can ping yet another host 10.1.0.239/16 on the physical/logical network.  That host, has under some Dom0/DomU configuration permutation of hours gone, connected via ssh to DomU.
This leads me to think the problem must be within Dom0's routing/forwarding/ARPing.

So DomU routing table is;
DomU# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
loopback        localhost       255.0.0.0       UG    0      0        0 lo
default         *               0.0.0.0         U     0      0        0 eth0

Dom0# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.9.0.1        *               255.255.255.255 UH    0      0        0 vif6.0
10.1.0.0        *               255.255.0.0     U     0      0        0 eth0
default         10.1.0.253      0.0.0.0         UG    0      0        0 eth0

Seams fine. As I can ping real host 10.1.0.239/16, does this mean the routing is OK?

If so, is it an ARP blip?
Dom0# arp
Address                  HWtype  HWaddress           Flags Mask            Iface
10.1.0.253               ether   00:05:5D:9F:87:0E   C                     eth0
10.9.0.1                 ether   00:16:3E:28:B6:BD   C                     vif6.0
Dom0.someip.net          ether   00:16:CB:85:35:4E   C                     eth0
10.1.0.239               ether   00:B0:D0:AD:A3:E4   C                     eth0

DomU# arp
Address                  HWtype  HWaddress           Flags Mask            Iface
10.1.0.254               ether   FE:FF:FF:FF:FF:FF   C                     eth0
203.0.178.191            ether   FE:FF:FF:FF:FF:FF   C                     eth0
10.1.0.239               ether   FE:FF:FF:FF:FF:FF   C                     eth0
10.1.0.253               ether   FE:FF:FF:FF:FF:FF   C                     eth0

I tried deleting both arp entries, then pinging, but they re-appear.
Firewalling? I have Shorewall installed, but not enabled, nor run.
Some odd kernel compilation? Dunno. Will recompile as vanilla in the morning.
Others on this list seamed to have suffered this.
links:
Mooktakim Ahmed has it working, although I cannot replicate.


I also note that if vif [ 'vifname=vifabc.0' ] is specified, there is no Net0 RX:.... displayed within xentop

vif = [ 'ip=10.9.0.1' ]
xentop - 00:40:47   Xen 3.0.1
2 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 2096640k total, 552644k used, 1543996k free    CPUs: 4 @ 3189MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) SSID
  Domain-0 -----r         33    0.1     131196    6.3   no limit       n/a     4    8        0        0    0
Net0 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net1 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net2 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net3 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net4 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net5 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net6 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net7 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
    DomU   --b---         11    0.0     393160   18.8     393216      18.8     4    1        0        0    0
Net0 RX:      126bytes        3pkts        0err        0drop  TX:       42bytes        1pkts        0err        0drop

vif = [ 'ip=10.9.0.1,vifname=vif-eu.0' ]
xentop - 00:44:11   Xen 3.0.1
2 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 2096640k total, 552668k used, 1543972k free    CPUs: 4 @ 3189MHz
      NAME  STATE   CPU(sec) CPU(%)     MEM(k) MEM(%)  MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) SSID
  Domain-0 -----r         38    0.1     131196    6.3   no limit       n/a     4    8        0        0    0
Net0 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net1 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net2 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net3 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net4 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net5 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net6 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
Net7 RX:        0bytes        0pkts        0err        0drop  TX:        0bytes        0pkts        0err        0drop
    DomU   --b---         11    0.0     393184   18.8     393216      18.8     4    0        0        0    0

I really appreciate any assistance with this fantastic software.

Piers Dawson-Damer
_____________________________________________________________________________________
Gentoo 2006.0 built, on Poweredge 1600SC
vmlinuz-2.6.12.6-xen0
vmlinuz-2.6.12.6-xenU

CFLAGS="-O2 -march=pentium4 -pipe -mno-tls-direct-seg-refs"
USE="-ipv6 -alsa -apache2 -arts -cups -eds -emboss -encode -esd -foomaticdb -gif -gnome -gstreamer -gtk -gtk2 -imlib -jpeg -kde -libg++ -mad -mikmod -motif -mp3 -mpeg -ogg -opengl -oss -pdflib -png -qt -quicktime -sdl -spell -truetype -vorbis -X -xmms -xv"

Dom0 # emerge world -pve

These are the packages that I would merge, in order:

Calculating world dependencies ...done!
[ebuild  N    ] sys-devel/patch-2.5.9  -build -static 0 kB
[ebuild  N    ] sys-libs/gpm-1.20.1-r4  -emacs (-selinux) 0 kB
[ebuild  N    ] sys-libs/ncurses-5.4-r6  -bootstrap -build -debug -doc +gpm -minimal -nocxx -unicode 0 kB
[ebuild  N    ] sys-devel/binutils-config-1.8-r6  0 kB
[ebuild  N    ] sys-devel/gnuconfig-20060227  0 kB
[ebuild  N    ] sys-devel/binutils-2.16.1  -multislot -multitarget +nls -test -vanilla 0 kB
[ebuild  N    ] sys-devel/gcc-config-1.3.13-r1  0 kB
[ebuild  N    ] sys-devel/m4-1.4.4  +nls 0 kB
[ebuild  N    ] sys-devel/bison-2.1  +nls -static 0 kB
[ebuild  N    ] virtual/libintl-0  0 kB
[ebuild  N    ] sys-apps/sed-4.1.4-r1  -bootstrap -build +nls -static 0 kB
[ebuild  N    ] sys-libs/zlib-1.2.3  -build 0 kB
[ebuild  N    ] sys-devel/gcc-3.4.5-r1  (-altivec) -bootstrap -boundschecking -build -doc +fortran -gcj -gtk -hardened -ip28 (-multilib) -multislot (-n32) (-n64) +nls -nocxx -nopie -nossp -objc -vanilla 0 kB
[ebuild  N    ] sys-libs/libstdc++-v3-3.3.4  -build (-multilib) +nls +nptl 0 kB
[ebuild  N    ] sys-kernel/linux-headers-2.6.11-r2  0 kB
[ebuild  N    ] sys-libs/timezone-data-2006a  0 kB
[ebuild  N    ] sys-libs/glibc-2.3.5-r3  -build -erandom -glibc-compat20 -glibc-omitfp -hardened -linuxthreads-tls (-multilib) +nls +nptl -nptlonly -pic -profile (-selinux) +userlocales 0 kB
[ebuild  N    ] sys-devel/gettext-0.14.4  -doc -emacs +nls 0 kB
[ebuild  N    ] sys-apps/texinfo-4.8-r2  -build +nls -static 0 kB
[ebuild  N    ] sys-apps/groff-1.19.1-r2  -X 0 kB
[ebuild  N    ] sys-apps/man-1.6-r1  +nls 0 kB
[ebuild  N    ] sys-apps/man-pages-2.26  +nls 0 kB
[ebuild  N    ] sys-apps/grep-2.5.1-r8  -build +nls -static 0 kB
[ebuild  N    ] app-arch/gzip-1.3.5-r8  -build +nls -pic -static 0 kB
[ebuild  N    ] sys-libs/db-4.2.52_p2-r1  -bootstrap -doc -java -nocxx -tcltk 0 kB
[ebuild  N    ] sys-libs/gdbm-1.8.3-r2  +berkdb 0 kB
[ebuild  N    ] sys-devel/libperl-5.8.7  +berkdb -debug +gdbm -ithreads 0 kB
[ebuild  N    ] dev-lang/perl-5.8.7-r3  +berkdb -build -debug -doc +gdbm -ithreads -minimal -perlsuid 0 kB
[ebuild  N    ] app-shells/bash-3.0-r12  -bashlogger -build +nls 0 kB
[ebuild  N    ] app-admin/perl-cleaner-1.01  0 kB
[ebuild  N    ] perl-core/Test-Simple-0.62  -minimal 0 kB
[ebuild  N    ] virtual/perl-Test-Simple-0.62  0 kB
[ebuild  N    ] dev-perl/Locale-gettext-1.05  -minimal 0 kB
[ebuild  N    ] sys-apps/help2man-1.33.1  +nls 0 kB
[ebuild  N    ] sys-devel/autoconf-2.13  0 kB
[ebuild  N    ] sys-devel/autoconf-wrapper-3-r1  0 kB
[ebuild  N    ] sys-devel/autoconf-2.59-r7  -emacs 0 kB
[ebuild  N    ] sys-devel/automake-1.5  0 kB
[ebuild  N    ] sys-devel/automake-1.8.5-r3  0 kB
[ebuild  N    ] sys-devel/automake-1.6.3  0 kB
[ebuild  N    ] sys-devel/automake-1.7.9-r1  0 kB
[ebuild  N    ] sys-devel/automake-1.4_p6  0 kB
[ebuild  N    ] sys-devel/automake-wrapper-1-r1  0 kB
[ebuild  N    ] sys-devel/automake-1.9.6-r1  0 kB
[ebuild  N    ] sys-libs/readline-5.1_p2  0 kB
[ebuild  N    ] sys-apps/diffutils-2.8.7-r1  +nls -static 0 kB
[ebuild  N    ] dev-libs/openssl-0.9.7i  -bindist -emacs -test +zlib 0 kB
[ebuild  N    ] app-misc/ca-certificates-20050804  0 kB
[ebuild  N    ] dev-libs/expat-1.95.8  -test 0 kB
[ebuild  N    ] dev-lang/python-2.4.2  -X +berkdb -bootstrap -build -doc +gdbm -ipv6 +ncurses -nocxx +readline +ssl -tcltk -ucs2 0 kB
[ebuild  N    ] dev-python/python-fchksum-1.7.1  0 kB
[ebuild  N    ] sys-apps/sandbox-1.2.12  0 kB
[ebuild  N    ] app-misc/pax-utils-0.1.10  -caps 0 kB
[ebuild  N    ] sys-apps/debianutils-2.14.1-r1  -build -static 0 kB
[ebuild  N    ] sys-apps/portage-2.0.54  -build -doc (-selinux) 0 kB
*** Please update portage to the above version before proceeding.
    Failure to do so may result in failed or improper merges.
    A simple 'emerge -u portage' is sufficient.

[ebuild  N    ] sys-libs/cracklib-2.8.5-r1  +nls +python 0 kB
[ebuild  N    ] sys-devel/flex-2.5.33-r1  +nls -static 0 kB
[ebuild  N    ] dev-util/pkgconfig-0.20  -hardened 0 kB
[ebuild  N    ] sys-libs/pam-0.78-r3  +berkdb -nis -pam_chroot -pam_console -pam_timestamp -pwdb (-selinux) 0 kB
[ebuild  N    ] sys-apps/shadow-4.0.14-r1  +nls -nousuid +pam (-selinux) -skey 0 kB
[ebuild  N    ] sys-devel/libtool-1.5.22  0 kB
[ebuild  N    ] sys-apps/pam-login-4.0.14  -livecd +nls (-selinux) -skey 0 kB
[ebuild  N    ] sys-libs/com_err-1.38  +nls 0 kB
[ebuild  N    ] sys-libs/ss-1.38  +nls 0 kB
[ebuild  N    ] sys-fs/e2fsprogs-1.38-r1  +nls -static 0 kB
[ebuild  N    ] app-crypt/hashalot-0.3-r2  0 kB
[ebuild  N    ] sys-apps/util-linux-2.12r-r2  +crypt +nls -old-crypt +pam +perl (-selinux) -static 0 kB
[ebuild  N    ] sys-devel/make-3.80-r4  -build +nls -static 0 kB
[ebuild  N    ] dev-util/gperf-3.0.1  0 kB
[ebuild  N    ] sys-devel/dev86-0.16.17-r2  0 kB
[ebuild  N    ] sys-apps/sysvinit-2.86-r3  -bootstrap -build -ibm (-selinux) -static 0 kB
[ebuild  N    ] sys-apps/coreutils-5.2.1-r7  -acl -build +nls (-selinux) -static 0 kB
[ebuild  N    ] sys-apps/baselayout-1.11.14-r6  -bootstrap -build -static -unicode 0 kB
[ebuild  N    ] sys-apps/hotplug-base-20040401  0 kB
[ebuild  N    ] sys-fs/udev-079-r1  (-selinux) 0 kB
[ebuild  N    ] net-misc/curl-7.15.1-r1  -ares -gnutls -idn -ipv6 -kerberos -krb4 -ldap +ssl -test 0 kB
[ebuild  N    ] net-misc/bridge-utils-1.0.6-r3  -sysfs 0 kB
[ebuild  N    ] sys-apps/iproute2-2.6.15.20060110  -atm +berkdb -minimal 0 kB
[ebuild  N    ] app-emulation/xen-3.0.1-r4  -custom-cflags -debug -doc -pae -screen 0 kB
[ebuild  N    ] sys-kernel/xen-sources-2.6.12.6-r3  -build -doc -symlink 0 kB
[ebuild  N    ] sys-process/cronbase-0.3.2  0 kB
[ebuild  N    ] net-mail/mailbase-1  +pam 0 kB
[ebuild  N    ] mail-mta/ssmtp-2.61  -ipv6 -mailwrapper -md5sum +ssl 0 kB
[ebuild  N    ] sys-process/vixie-cron-4.1-r8  -debug +pam (-selinux) 0 kB
[ebuild  N    ] sys-apps/tcp-wrappers-7.6-r8  -ipv6 0 kB
[ebuild  N    ] net-misc/openssh-4.2_p1-r1  -X509 -chroot -hpn -ipv6 -kerberos -ldap -libedit +pam (-selinux) -sftplogging -skey -smartcard -static +tcpd 0 kB
[ebuild  N    ] dev-libs/popt-1.7-r1  +nls 0 kB
[ebuild  N    ] net-misc/rsync-2.6.0-r6  -acl -build -livecd -static -xinetd 0 kB
[ebuild  N    ] app-backup/rsnapshot-1.2.1  0 kB
[ebuild  N    ] sys-apps/kbd-1.12-r6  +nls 0 kB
[ebuild  N    ] net-dialup/ppp-2.4.2-r15  -activefilter -atm -dhcp -ipv6 -mppe-mppc +pam -radius 0 kB
[ebuild  N    ] net-dialup/rp-pppoe-3.7  -X 0 kB
[ebuild  N    ] net-dns/dnsmasq-2.22  0 kB
[ebuild  N    ] sys-apps/net-tools-1.60-r11  +nls -static 0 kB
[ebuild  N    ] sys-apps/module-init-tools-3.2.1  0 kB
[ebuild  N    ] sys-apps/gawk-3.1.5  -build +nls 0 kB
[ebuild  N    ] app-arch/bzip2-1.0.3-r6  -build -static 0 kB
[ebuild  N    ] app-arch/tar-1.15.1-r1  -build +bzip2 +nls -static 0 kB
[ebuild  N    ] sys-process/psmisc-22.1  -X -ipv6 +nls (-selinux) 0 kB
[ebuild  N    ] sys-apps/file-4.13  -build +python 0 kB
[ebuild  N    ] app-editors/nano-1.3.9  -build -debug -justify -minimal +ncurses +nls -slang -spell -unicode 0 kB
[ebuild  N    ] sys-boot/grub-0.96-r2  -custom-cflags -netboot -static 0 kB
[ebuild  N    ] sys-apps/pciutils-2.2.0-r1  0 kB
[ebuild  N    ] sys-kernel/genkernel-3.3.11  -bootsplash -ibm 0 kB
[ebuild  N    ] app-arch/cpio-2.6-r5  +nls 0 kB
[ebuild  N    ] sys-apps/mkinitrd-3.5.7-r3  (-selinux) 0 kB
[ebuild  N    ] net-misc/iputils-021109-r3  -doc -ipv6 -static 0 kB
[ebuild  N    ] sys-process/procps-3.2.6  (-n32) 0 kB
[ebuild  N    ] dev-util/ccache-2.3  0 kB
[ebuild  N    ] sys-apps/findutils-4.1.20-r2  -build +nls (-selinux) -static 0 kB
[ebuild  N    ] dev-libs/libol-0.3.17  0 kB
[ebuild  N    ] app-admin/syslog-ng-1.6.9  -hardened (-selinux) -static +tcpd 0 kB
[ebuild  N    ] sys-fs/device-mapper-1.02.02  0 kB
[ebuild  N    ] sys-fs/lvm2-2.01.09  +nolvmstatic +readline 0 kB
[ebuild  N    ] net-misc/wget-1.10.2  -build -debug -ipv6 +nls -socks5 +ssl -static 0 kB
[ebuild  N    ] sys-kernel/gentoo-sources-2.6.15-r1  -build -doc -symlink (-ultra1) 0 kB
[ebuild  N    ] sys-apps/which-2.16  0 kB
[ebuild  N    ] net-firewall/iptables-1.3.4  -extensions -ipv6 -static 0 kB
[ebuild  N    ] net-firewall/shorewall-3.0.4  -doc 0 kB
[ebuild  N    ] app-admin/logrotate-3.7.1-r2  (-selinux) 0 kB
[ebuild  N    ] sys-apps/less-385_p4-r2  -unicode 0 kB
[ebuild  N    ] sys-apps/hdparm-6.3  0 kB
[ebuild  N    ] sys-apps/busybox-1.1.0  -debug -floppyboot -make-symlinks -netboot -savedconfig -static 0 kB
[ebuild  N    ] sys-libs/pwdb-0.62  (-selinux) 0 kB 
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