Re: [Engine-devel] network features review

From: "Dan Kenigsberg" <danken(a)redhat.com&gt; To: "avi tal" <atal(a)redhat.com&gt; Cc: engine-devel(a)ovirt.org Sent: Tuesday, May 22, 2012 4:54:09 PM Subject: Re: [Engine-devel] network features review On Tue, May 22, 2012 at 03:53:56PM +0300, avi tal wrote: > On 05/22/2012 03:06 PM, Livnat Peer wrote: > >On 22/05/12 14:35, avi tal wrote: > >>On 05/22/2012 11:45 AM, Livnat Peer wrote: > >>>Hi All, > >>> > >>>This is a summary of comments we(*) gathered while reviewing the > >>>current > >>>network related functionality in oVirt, we'll open the relevant > >>>RFE/Bugs > >>>but wanted to share first to get comments: > >>> > >>> > >>>Default Gateway: > >>>---------------- > >>>current status - > >>> In the UI/API we expose to the user the possibility to > >>> configure the > >>> default gateway for the host. We expose this option only > >>> when editing > >>> the management network. > >>> > >>>comments - > >>>Apparently we do not configure the host default gateway but the > >>>network gateway. > >>> > >>>1. We need to fix the phrasing to gateway (not default gateway) > >>not true. especially in linux we configure "default gateway". > >>unlike > >>windows which holds gateway for each interface, linux holds only > >>one > >>default gateway. > >I'll leave this one to Danken. > > Running POC in my machine: > # cat ifcfg-eth1 > DEVICE=eth1 > ONBOOT=yes > BOOTPROTO=static > IPADDR=X.Y.129.10 > NETMASK=255.255.255.0 > GATEWAY=X.Y.129.254 > > # cat ifcfg-eth2 > DEVICE=eth2 > ONBOOT=yes > BOOTPROTO=static > IPADDR=X.Y.127.10 > NETMASK=255.255.255.0 > GATEWAY=X.Y.127.254 > > # cat /etc/sysconfig/network > NETWORKING=yes > HOSTNAME=... > GATEWAY=X.Y.128.254 > > # service network restart > # route -n > Kernel IP routing table > Destination Gateway Genmask Flags Metric Ref > Use Iface > X.Y.129.0 0.0.0.0 255.255.255.0 U 0 0 > 0 eth1 > X.Y.127.0 0.0.0.0 255.255.255.0 U 0 0 > 0 eth2 > 169.254.0.0 0.0.0.0 255.255.0.0 U 1003 0 > 0 eth1 > 169.254.0.0 0.0.0.0 255.255.0.0 U 1004 0 > 0 eth2 > 169.254.0.0 0.0.0.0 255.255.0.0 U 1005 0 > 0 eth3 > 0.0.0.0 X.Y.127.254 0.0.0.0 UG 0 0 > 0 eth2 > > > NOTE: we can add static routing to each interface using > route-<interface> I am afraid that I've been misleading Livnat and Simon in private communications. I've repressed this fact for a long while, but apparently initscripts's usage of GATEWAY, be it in interface or hostwide config, is to set the host's default gateway. /etc/sysconfig/network-scripts/ifup-eth : if [ -n "${GATEWAY}" ] ...; then ip route replace default ${METRIC:+metric $METRIC} \ via ${GATEWAY} ${WINDOW:+window $WINDOW} ${SRC} \ ${GATEWAYDEV:+dev $GATEWAYDEV} ... This means that oVirt's current behavior is ok as it is - we set GATEWAY for a single network that is always on, and thus control the host's default gateway.

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