topic Re: HP TCPIP Alias in Operating System - OpenVMS

HP TCPIP Alias

rison so_1 — Wed, 19 Jul 2006 20:55:51 GMT

I've IP alias assigned to both WE0 on my 2 node cluster. My understanding is that whichever node start up first will take ownership of the IP allias.

My question is that can I reassign the ownership of the IP aliase to other node without shutting down the TCPIP ?

Re: HP TCPIP Alias

david tan_4 — Wed, 19 Jul 2006 22:49:11 GMT

Hi Rison,

Depending on how the alias address was assigned, if it was assigned to the other node as a "home alias", then this address will migrate to that node when it boots up. This depends of course on no more connections to the alias on the current node.

Please email me if you need clarification.

/David Tan

Re: HP TCPIP Alias

rison so_1 — Wed, 19 Jul 2006 22:55:28 GMT

I think it is home alias.

Here is the output from ifconfig on both node:

DS20E > ifconfig -a
LO0: flags=100c89

TN0: flags=80

TN1: flags=80

WE0: flags=c43
*inet 203.102.145.25 netmask ffffffe0 broadcast 203.102.145.31 ipmtu 1500
inet 203.102.145.10 netmask ffffffe0 broadcast 203.102.145.31 ipmtu 1500

WE1: flags=c43
failSAFE IP Addresses:
inet 203.102.145.10 netmask ffffffe0 broadcast 203.102.145.31 (on DS20E
WE0)
*inet 10.20.0.15 netmask ffff0000 broadcast 10.20.255.255 ipmtu 1500

---------------------------------------
ES45 > ifconfig -a
LO0: flags=100c89

TN0: flags=80

TN1: flags=80

WE0: flags=c43
failSAFE IP Addresses:
inet 203.102.145.10 netmask ffffffe0 broadcast 203.102.145.31 (on DS20E
WE0)
*inet 203.102.145.2 netmask ffffffe0 broadcast 203.102.145.31 ipmtu 1500

WE1: flags=c43
failSAFE IP Addresses:
inet 203.102.145.10 netmask ffffffe0 broadcast 203.102.145.31 (on DS20E
WE0)
*inet 10.20.0.13 netmask ffff0000 broadcast 10.20.255.255 ipmtu 1500

Re: HP TCPIP Alias

Volker Halle — Thu, 20 Jul 2006 00:52:41 GMT

Rison,

your IP alias (failSAFE IP address 203.102.145.10) has not been defined with a HOME interface. HOME interfaces are designated with a '*' preceeding the 'inet' string in the ifconfig -a output.

To define an alias with a home interface, use:

$ ifconfig we0 home alias 203.102.145.10

You can easily (temporarily) remove an alias from a specific interface. It will then fail over to another interface, which has this alias defined:

$ ifconfig we0 -alias 203.102.145.10

Please keep in mind, that sessions established using this alias IP address may be terminated, if the alias will have to fail over to another node in the cluster.

Once the alias has moved to the desired interface/node, you can re-add it on the interfaces, from which you temporarily removed it.

Volker.

Re: HP TCPIP Alias

rison so_1 — Thu, 20 Jul 2006 01:05:58 GMT

Thanks Volker.

It worked and it is that simple.