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[21:20] <jbergstroem> having issues switching an ip address from my vps to a dedicated machine. feels like it still routes to the vps. does anyone know if I have to do anything esle than deassign/assign?
[21:22] <jbergstroem> waited for 10 minutes before rolling back
[21:23] <toddf> are both on the same vlan? treat them both as if they are physical machines
[21:24] <jbergstroem> i have a /29 and currently assign 3 ip's to my dedicated and 2 to my vps. when trying to switch the most "active" ip, it just doesn't seem to work
[21:25] <jbergstroem> i tried a similar switch with an unused ip some days ago which worked
[21:33] <jbergstroem> is there something i fundamentally fail to understand here? :/
[21:34] <toddf> sounds like you've done your homework, if the vps stops responding to it and the other system starts, arp cache timeouts should be all that is in your way
[21:34] <toddf> its possible you hit a lucky time in the arp cache timeout in your testing, no guarantees though
[21:34] <jbergstroem> the old system doesn't respond to old ip (and ifconfig doesn't show it), new machine allocates it (shows up in ifconfig), but i cannot have 10 minutes more fo downtime not knowing :(
[21:35] <toddf> update dns to point to another ip responded to by the new system?
[21:36] <jbergstroem> i don't control all domain names pointing to that ip
[21:36] <_mnathani_> jbergstroem: Is the IP being assigned to a NIC that already has an IP and therefore assigning multiple IPs to the sam MAC address or is this a new MAC ?
[21:36] <jbergstroem> _mnathani_: i bond the two interfaces to one mac address that has multiple ip addresses assigned to it
[21:37] <jbergstroem> i use the ip that is moved as primary (all outgoing is going through it)
[21:37] <_mnathani_> can you try making the IP you are moving the primary IP on the dedicated and ping the gateway
[21:37] <_mnathani_> that would update the ARP I am pretty sure
[21:38] <jbergstroem> i did
[21:38] <jbergstroem> gateway didn't respond
[21:38] <_mnathani_> thats odd
[21:38] <jbergstroem> yes, i agree
[21:38] <_mnathani_> could you ping an outside internet ip?
[21:38] <_mnathani_> like say 8.8.8.8
[21:39] <jbergstroem> no, nothing from the machine since outgoing traffic was meant to go through that ip
[21:39] <jbergstroem> things i bind to the other ip's work fine though
[21:40] <_mnathani_> Did your VPS get upgraded to use gigabit networking?
[21:40] <jbergstroem> no
[21:40] <jbergstroem> 'beta' and was moving any time anyway
[21:40] <_mnathani_> and the gateway assigned is the same on both the VPS and dedicated?
[21:40] <jbergstroem> yes, same netmasks, broadcasts etc
[21:42] <_mnathani_> when you move the IP from the VPS, do you assign another IP / Primary to the VPS ?
[21:42] <jbergstroem> yes, i have two assigned so i don't have to mess with kvm.
[21:42] <jbergstroem> the second ip i used to experiment this transition with a coulpe of days ago. worked well.
[21:43] <_mnathani_> can you ping the troublesome ip from the vps after the move to dedicated?
[21:43] <jbergstroem> no. not from anywhere
[21:44] <_mnathani_> my understanding of ARP networks infrastructure is that they place VPS and Dedicated on the same VLAN, so in thery it should work just fine
[21:44] <jbergstroem> yes, that's what help says as well, and from moving other ip's im inclined to agree
[21:44] <_mnathani_> are you able to flush arp cache and retry?
[21:44] <jbergstroem> how?
[21:45] <_mnathani_> what OS?
[21:45] <jbergstroem> linux
[21:45] <jbergstroem> but is it really my arp cache that needs to be flushed?
[21:46] <_mnathani_> it might be whats causing the gateway to retain the VPS MAC address for the troubled IP
[21:46] <_mnathani_> http://www.lainoox.com/display-add-flush-arpcache-linux-arp/
[21:47] <_mnathani_> instead of flush, you could delete the specific entry
[21:47] <jbergstroem> arp cache displays same records
[21:47] <_mnathani_> like:
[21:47] <_mnathani_> arp -i eth0 -d 10.11.12.13
[21:47] <_mnathani_> on dedicated or virtual?
[21:47] <jbergstroem> yeah, i know how to clear it, but are not very willing to get additional downtime to try it
[21:47] <jbergstroem> on both
[21:48] <_mnathani_> after removing from vps it should no longer show the old mac, it should update to the new mac from dedicated
[21:48] <jbergstroem> but shouldn't the cached gateway mac be the same on both machines?
[21:48] <_mnathani_> yes, gateway mac should be the same
[21:49] <jbergstroem> i don't think arp caches locally assigned ip addresses.
[21:50] <_mnathani_> right
[21:50] <_mnathani_> I was going for the troubled IP after assigning to dedicated, then ping from vps and check cache
[21:51] <jbergstroem> just tried, and nope.
[21:51] <jbergstroem> no cache.
[21:52] <_mnathani_> when pinging the ip from outside the network, does it timeout when moving to dedicated?
[21:53] <_mnathani_> or does the old vpn still respond?
[21:53] <_mnathani_> *vps
[21:53] <jbergstroem> i can't reach the gateway at all if i migrate the ip address
[21:53] <jbergstroem> times out
[21:53] <jbergstroem> old vpn does not have that ipa ddress assigned, so it doesn't respond
[21:55] <jbergstroem> there. just switched
[21:55] <_mnathani_> seems like some kind of security on the switch port
[21:57] <_mnathani_> one other thing, your dedicated server has 2 network interfaces, are you doing any kind of redundant load balancing configuration?
[21:57] <jbergstroem> took 3 minutes though
[21:57] <_mnathani_> so its working now?
[21:58] <jbergstroem> yes
[21:58] <jbergstroem> so, nothing from my end
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