[CentOS-virt] incoming works out does not (prolly a newbie question)

compdoc compdoc at hotrodpc.com
Tue Jul 13 20:08:08 EDT 2010


I never work with that subnet so this may be a dumb thing to say, but isn't
the 255.255.254.0 mask giving you 510 hosts, so the broadcast address should
be higher than 255?

The guest is using br0?



> -----Original Message-----
> From: centos-virt-bounces at centos.org [mailto:centos-virt-
> bounces at centos.org] On Behalf Of Chaim Rieger
> Sent: Tuesday, July 13, 2010 2:51 PM
> To: centos-virt at centos.org
> Subject: [CentOS-virt] incoming works out does not (prolly a newbie
> question)
> 
> host and guest both centos 5.5
> network is 192.168.62.40
> host is setup as follows
> 
> 
> [root at cloud2 ~]# ifconfig
> br0       Link encap:Ethernet  HWaddr 00:1A:64:12:10:D9
>           inet addr:192.168.62.199  Bcast:192.168.63.255
Mask:255.255.254.0
>           inet6 addr: fe80::21a:64ff:fe12:10d9/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1705488 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1130086 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:1103112199 (1.0 GiB)  TX bytes:2544941783 (2.3 GiB)
> 
> eth0      Link encap:Ethernet  HWaddr 00:1A:64:12:10:D9
>           inet6 addr: fe80::21a:64ff:fe12:10d9/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:1714601 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:2243903 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:1134903389 (1.0 GiB)  TX bytes:2627513407 (2.4 GiB)
>           Interrupt:90 Memory:c8000000-c8012800
> 
> 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:10396 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:10396 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:8188566 (7.8 MiB)  TX bytes:8188566 (7.8 MiB)
> 
> virbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00
>           inet addr:192.168.62.1  Bcast:192.168.62.255  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:0 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:222 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:0 (0.0 b)  TX bytes:16218 (15.8 KiB)
> 
> vnet0     Link encap:Ethernet  HWaddr 9A:B0:F1:FE:9F:1C
>           inet6 addr: fe80::98b0:f1ff:fefe:9f1c/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:128 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:1504 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:500
>           RX bytes:18288 (17.8 KiB)  TX bytes:105343 (102.8 KiB)
> 
> [root at cloud2 network-scripts]# cat ifcfg-eth0 # Broadcom Corporation
> NetXtreme II BCM5708 Gigabit Ethernet
> DEVICE=eth0
> #BOOTPROTO=static
> #BROADCAST=192.168.63.255
> #HWADDR=00:1A:64:12:10:D9
> #IPADDR=192.168.62.22
> #NETMASK=255.255.254.0
> #NETWORK=192.168.62.0
> ONBOOT=yes
> BRIDGE=br0
> 
> [root at cloud2 network-scripts]# cat ifcfg-br0 # Broadcom Corporation
> NetXtreme II BCM5708 Gigabit Ethernet TYPE=Bridge
> DEVICE=br0
> #BOOTPROTO=static
> BROADCAST=192.168.63.255
> #HWADDR=00:1A:64:12:10:D9
> IPADDR=192.168.62.199
> NETMASK=255.255.254.0
> NETWORK=192.168.62.0
> ONBOOT=yes
> 
> KVM image is as follows
> [root at www ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
> # Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+
> DEVICE=eth0
> BOOTPROTO=none
> BROADCAST=192.168.63.255
> HWADDR=54:52:00:04:00:1d
> IPADDR=192.168.62.14
> NETMASK=255.255.254.0
> NETWORK=192.168.62.0
> ONBOOT=yes
> GATEWAY=192.168.62.40
> TYPE=Ethernet
> 
> 
> i can access the kvm image from other hosts on the network , but the kvm
> image can not access anything except for the gateway
> 
> what am i doing wrong here
> 
> thanx
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