#arpnetworks 2013-05-25,Sat

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WhoWhatWhen
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jbergstroemhaving 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?
waited for 10 minutes before rolling back
[21:20]
toddfare both on the same vlan? treat them both as if they are physical machines [21:23]
jbergstroemi 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
i tried a similar switch with an unused ip some days ago which worked
[21:24]
is there something i fundamentally fail to understand here? :/ [21:33]
toddfsounds 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
its possible you hit a lucky time in the arp cache timeout in your testing, no guarantees though
[21:34]
jbergstroemthe 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 :( [21:34]
toddfupdate dns to point to another ip responded to by the new system? [21:35]
jbergstroemi 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
i use the ip that is moved as primary (all outgoing is going through it)
[21:36]
_mnathani_can you try making the IP you are moving the primary IP on the dedicated and ping the gateway
that would update the ARP I am pretty sure
[21:37]
jbergstroemi did
gateway didn't respond
[21:38]
_mnathani_thats odd [21:38]
jbergstroemyes, i agree [21:38]
_mnathani_could you ping an outside internet ip?
like say 8.8.8.8
[21:38]
jbergstroemno, nothing from the machine since outgoing traffic was meant to go through that ip
things i bind to the other ip's work fine though
[21:39]
_mnathani_Did your VPS get upgraded to use gigabit networking? [21:40]
jbergstroemno
'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]
jbergstroemyes, same netmasks, broadcasts etc [21:40]
_mnathani_when you move the IP from the VPS, do you assign another IP / Primary to the VPS ? [21:42]
jbergstroemyes, i have two assigned so i don't have to mess with kvm.
the second ip i used to experiment this transition with a coulpe of days ago. worked well.
[21:42]
_mnathani_can you ping the troublesome ip from the vps after the move to dedicated? [21:43]
jbergstroemno. not from anywhere [21:43]
_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]
jbergstroemyes, 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]
jbergstroemhow? [21:44]
_mnathani_what OS? [21:45]
jbergstroemlinux
but is it really my arp cache that needs to be flushed?
[21:45]
_mnathani_it might be whats causing the gateway to retain the VPS MAC address for the troubled IP
http://www.lainoox.com/display-add-flush-arpcache-linux-arp/

instead of flush, you could delete the specific entry
[21:46]
jbergstroemarp cache displays same records [21:47]
_mnathani_like:
arp -i eth0 -d 10.11.12.13
on dedicated or virtual?
[21:47]
jbergstroemyeah, i know how to clear it, but are not very willing to get additional downtime to try it
on both
[21:47]
_mnathani_after removing from vps it should no longer show the old mac, it should update to the new mac from dedicated [21:48]
jbergstroembut shouldn't the cached gateway mac be the same on both machines? [21:48]
_mnathani_yes, gateway mac should be the same [21:48]
jbergstroemi don't think arp caches locally assigned ip addresses. [21:49]
_mnathani_right
I was going for the troubled IP after assigning to dedicated, then ping from vps and check cache
[21:50]
jbergstroemjust tried, and nope.
no cache.
[21:51]
_mnathani_when pinging the ip from outside the network, does it timeout when moving to dedicated?
or does the old vpn still respond?
*vps
[21:52]
jbergstroemi can't reach the gateway at all if i migrate the ip address
times out
old vpn does not have that ipa ddress assigned, so it doesn't respond
there. just switched
[21:53]
_mnathani_seems like some kind of security on the switch port
one other thing, your dedicated server has 2 network interfaces, are you doing any kind of redundant load balancing configuration?
[21:55]
jbergstroemtook 3 minutes though [21:57]
_mnathani_so its working now? [21:57]
jbergstroemyes
so, nothing from my end
[21:58]
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