Difference between revisions of "AIX Servers in LVS/DR and LVS/TUN Clusters"

From LVSKB
Jump to: navigation, search
(→‎Introduction)
(→‎Disable ARP for VIP)
 
(10 intermediate revisions by the same user not shown)
Line 6: Line 6:
 
== Disable ARP for VIP ==
 
== Disable ARP for VIP ==
  
−
To know :
+
Background :
−
It is possible to disable arp on a real interface via noarp option on setup
+
It is possible to disable arp on a real interface via noarp option.
−
If a real interface is set up with arp on, you cannot add a inet alias on it whitout arp reply...
+
If a real interface is set up with arp on, you cannot add a inet alias on it whitout arp reply.
−
The AIX "Virtual IP Address Interface" implementation allow you to add a virtual interface
+
The AIX "Virtual IP Address Interface" implementation allow you to add a virtual interface (not an alias) that is not arp-able
  
  
Line 15: Line 15:
 
  smitty inet
 
  smitty inet
 
  select "Add de Virtual IP Address Interface"
 
  select "Add de Virtual IP Address Interface"
−
  under setup screen, specifiy :
+
  under setup screen, specify,
−
  VIP/32
+
  address : 10.80.1.3 (dotted decimal)
−
  netmask
+
  netmask : 255.255.255.0 (match your real network)
−
  interface name : vi1 (or whay you want)
+
  interface name : vi1 (or what you want)
−
  activate to : yes
+
  activate interface : yes
−
  real intarface to attach: lo (select the loopback, smitty failed to attach on a etherchannel int. in my case)
+
  interface to attach: lo0 (the real one, select the loopback ti disable arp)
  
−
That(s it  
+
Not real smit screens, it's a braindump...
  
−
From smitty, ODM should be updated for persistence after reboot.
+
Think ODM should be updated for persistence after reboot.
−
I didn't restart the system yet. I will confirm asap.
+
 
−
+
It works like a charm in production environments (1 yr now)
−
ifconfig lo0:1 VIP/32 netmask 255.255.255.255 up
+
That's it.
−
These two commands can be added just after configuring loopback command in the
+
 
−
/etc/rc.S/S??network, so that VIP can be brought up after system boots up.
+
--[[User:Bmontarges|Baptiste Montarges]] 01:58, 11 April 2010 (CST)
 +
 
 +
== References ==
 +
 
 +
* IBM documentation on Virtual Ethernet Interface on AIX
 +
 
 +
[[Category:ARP Issue]]

Latest revision as of 20:05, 14 April 2011

Introduction

In the AIX operating systems, ip addresses configured on the loopback interface will not participate the ARP protocol. Tested ok on AIX 6.1, sould works from AIX 5L

Disable ARP for VIP

Background : It is possible to disable arp on a real interface via noarp option. If a real interface is set up with arp on, you cannot add a inet alias on it whitout arp reply. The AIX "Virtual IP Address Interface" implementation allow you to add a virtual interface (not an alias) that is not arp-able


In LVS/DR clusters, we can disable ARP for VIP on AIX as follows: 

smitty inet
select "Add de Virtual IP Address Interface"
under setup screen, specify,
address : 10.80.1.3 (dotted decimal)
netmask : 255.255.255.0 (match your real network) 
interface name : vi1 (or what you want)
activate interface : yes
interface to attach: lo0 (the real one, select the loopback ti disable arp)

Not real smit screens, it's a braindump...

Think ODM should be updated for persistence after reboot.

It works like a charm in production environments (1 yr now) That's it.

--Baptiste Montarges 01:58, 11 April 2010 (CST)

References

  • IBM documentation on Virtual Ethernet Interface on AIX
Retrieved from "http://kb.linuxvirtualserver.org/wiki?title=AIX_Servers_in_LVS/DR_and_LVS/TUN_Clusters&oldid=5888"