Could two IP addresses assigned to same APA interface?

[Joe Shen]

Is it possible to assign two IP addresses of same subnet to the same APA interface?

I means, if two NIC is grouped into one virtual interface using APA. Could two IP addresses, such as 192.168.1.25 and 192.168.1.26, assigned to that virtual interface?

Joe

[Torsten.]

I seriously doubt that you can assign 2 addresses out of the same subnet to 1 NIC (exept some special procedures).

Why do you want to do this?

[Patrick Wallek]

Yes, that should work fine.

You can have 2 addresses from the same subnet on a single NIC, but NOT on different NICs.

[melvyn burnard]

yes, use the ifconfig lanxxx:y ip_# where xxx is your APA lan, and y is the next available nukber after 0 to add on to the exisitnig interface
e.g. you have 192.168.1.25 already assigned to lan900, and wish to add 192.168.1.26:
ifconfig lan900:1 192.168.1.26

Essentially this is what Serviceguard does, but using systemcalls and other commands

[Tim Nelson]

Your /etc/rc.config.d/netconf entries would look something like this.

#Virtual IP configuration
INTERFACE_NAME[1]=lan900:1
IP_ADDRESS[1]=192.168.1.125
SUBNET_MASK[1]=255.255.255.0
BROADCAST_ADDRESS[1]="192.168.1.255"
INTERFACE_STATE[1]="up"
DHCP_ENABLE[1]=0

INTERFACE_NAME[2]=lan900:2
IP_ADDRESS[2]=192.168.1.126
SUBNET_MASK[2]=255.255.255.0
BROADCAST_ADDRESS[2]="192.168.1.255"
INTERFACE_STATE[2]="up"
DHCP_ENABLE[2]=0

[rick jones]

You can add IP's to an aggregate just like you can add IP's to a "regular" interface. The transport doesn't know the difference between an aggregate and a single-port interface. They can be the same or different subnets.

And, you _can_ assign IP's from the same subnet to two different interfaces, it just may not behave as one might initially expect