I''m running x86_64 Fedora7 host and 32 bit Fedora 7 guest on KVM. Here
what the default bridged network setting gave me -
HOST -
[root@fed-amd64 ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:1A:A0:56:52:E5
inet addr:192.168.1.9 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::21a:a0ff:fe56:52e5/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:4144 errors:0 dropped:0 overruns:0 frame:0
TX packets:4490 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3143529 (2.9 MiB) TX bytes:1026716 (1002.6 KiB)
Interrupt:23 Base address:0x6000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:11074 errors:0 dropped:0 overruns:0 frame:0
TX packets:11074 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:49074613 (46.8 MiB) TX bytes:49074613 (46.8 MiB)
virbr0 Link encap:Ethernet HWaddr 00:FF:EE:14:6D:91
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:61 errors:0 dropped:0 overruns:0 frame:0
TX packets:86 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9261 (9.0 KiB) TX bytes:12220 (11.9 KiB)
vnet0 Link encap:Ethernet HWaddr 00:FF:EE:14:6D:91
inet6 addr: fe80::2ff:eeff:fe14:6d91/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:61 errors:0 dropped:0 overruns:0 frame:0
TX packets:61 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500
RX bytes:10115 (9.8 KiB) TX bytes:7195 (7.0 KiB)
[root@fed-amd64 ~]#
Here is what the GUEST landed up with when using the default configuration-
[root@fed-guest ~]# ifconfig
eth0 Link encap:Ethernet HWaddr 00:16:3E:6B:C6:36
inet addr:192.168.122.195 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::216:3eff:fe6b:c636/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1492 Metric:1
RX packets:4144 errors:0 dropped:0 overruns:0 frame:0
TX packets:4490 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3143529 (2.9 MiB) TX bytes:1026716 (1002.6 KiB)
Interrupt:23 Base address:0x6000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:11074 errors:0 dropped:0 overruns:0 frame:0
TX packets:11074 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:49074613 (46.8 MiB) TX bytes:49074613 (46.8 MiB)
virbr0 Link encap:Ethernet HWaddr 00:00:00:00:00:00
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:61 errors:0 dropped:0 overruns:0 frame:0
TX packets:86 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:9261 (9.0 KiB) TX bytes:12220 (11.9 KiB)
[root@fed-guest ~]#
The problem is that I''m unable to ping from the host to the guest (to
192.168.122.195). tcpdump shows that guest is not responding to ARPs
for 192.168.122.195. Can anyone tell me why?
When I ping from the guest to to 192.168.122.1 and 192.168.122.195,
both go through. But when I ssh into either of them to make sure I''m
reaching the host, the ssh lands into the guest itself. This means the
ping response on the guest is from itself - so the guest is also
unable to reach the host.
I googled and looked at the following sitew, but they were of not much
help for this problem -
http://www.gnome.org/~markmc/virtual-networking.html
http://watzmann.net/blog/index.php/2007/04/27/networking_with_kvm_and_libvirt
Am I missing something ?
Thanks,
KM
kewlemer
2007-Oct-27 20:11 UTC
[Fedora-xen] Re: ARP failing when I ping from host to guest
> The problem is that I''m unable to ping from the host to the guest (to > 192.168.122.195). tcpdump shows that guest is not responding to ARPs > for 192.168.122.195. Can anyone tell me why? >To be more specific, I''m doing a tcpdump on guest''s eth0(192.168.122.195). When the host pings 192.168.122.195, I see following - tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 96 bytes 12:15:49.058031 arp who-has 192.168.122.195 tell 192.168.122.1 12:15:51.065437 arp who-has 192.168.122.195 tell 192.168.122.1 12:15:52.069123 arp who-has 192.168.122.195 tell 192.168.122.1 12:15:53.071852 arp who-has 192.168.122.195 tell 192.168.122.1 12:15:55.077218 arp who-has 192.168.122.195 tell 192.168.122.1 When the guest''s eth0 is receiving ARP for it''s right IP address, why is it not responding? Here are the routing tables - HOST- [root@fed-amd64 ~]# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0 [root@fed-amd64 ~]# GUEST- [root@guest~]# netstat -rn Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 virbr0 192.168.122.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 169.254.0.0 0.0.0.0 255.255.0.0 U 0 0 0 eth0 0.0.0.0 192.168.122.1 0.0.0.0 UG 0 0 0 eth0 [root@guest ~]#> When I ping from the guest to to 192.168.122.1 and 192.168.122.195, > both go through. But when I ssh into either of them to make sure I''m > reaching the host, the ssh lands into the guest itself. This means the > ping response on the guest is from itself - so the guest is also > unable to reach the host. >Please ignore this. I figured that I have to use host''s eth0(192.168.1.9) to access the host from the guest. Thanks, KM