HP UX 10.20 CIDR support available?

[Stuart Smiles]

Hi gents,
happy new year.

We are trying to configures some visualise workstations (B180L) running hpux 10.20 with addresses in the range 192.168.0.0/ 255.255.255.128

When configured in SAM or with the setparms script this does not allow us to set anything other than 255.255.255.0 as the subnet.

we already have an interface in a subnet 10.0.1.1 / 255.255.255.0 - is it because both subnets on each interface have to be the same?

Is there any way we can change this or can we apply a patch or a kernel parameter to allow cidr.

Can we set it via ifconfig for it to be allowed?

net 192.168.0.0 - 192.168.0.127
avail 192.168.0.2 - 192.168.0.126

ws1 192.168.0.23 255.255.255.128
defgw 192.168.0.126


thanks
Stuart Smiles
stuart.smiles@nortelnetworks.com

[G. Vrijhoeven]

Hi,

check out:

http://docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90725/B2355-90725_top.html&con=/hpux/onlinedocs/B2355-90725/00/00/45-con.html&toc=/hpux/onlinedocs/B2355-90725/00/00/45-toc.html&searchterms=CIDR&queryid=20020104-043400

Gideon

[Bill Hassell]

In 10.20, you can modify the rules checking for small subnets. Normally, HP-UX enforces the standard RFC1122 which limits how small a subnet may be. However, RFC1878 does allow smaller subnets and the command nettune (10.20 only, 11.x the command is ndd).

nettune -h (ndd -h for 11.x) will show the tunable network parameters. To enable small subnets, you must turn off the tunable called ip_check_subnet_add.

First, check the current setting:

# /usr/contrib/bin/nettune -l ip_check_subnet_addr

or

# /usr/bin/ndd -get /dev/ip
ip_check_subnet_addr

To turn off this checking feature:

# /usr/contrib/bin/nettune -s ip_check_subnet_addr 0

or

# /usr/bin/ndd -set /dev/ip ip_check_subnet_addr 0

To make the change permanent, you'll need to put the values into a startup script. For 10.20, there is no nettune script, so you'll need to put a simple start script in /sbin/init.d:

#!/sbin/sh
/usr/contrib/bin/nettune -s ip_check_subnet_addr 0

You can call it nettune. Change permissions to 555 and ownership to bin:bin and to make it run starting at run level 2, use the command:

# ln -s /sbin/init.d/nettune /sbin/rc2.d/S006nettune

and for 11.x, it is much more standard. Edit the file in /etc/rc.config.d called ndd and add these lines:

TRANSPORT_NAME[0]=ip
NDD_NAME[0]=ip_check_subnet_addr
NDD_VALUE[0]=0

Note: the [0] refers to an array reference so related items belong together. If other tunables are desired, use the next available array location (starting from 0) for the next 3 items.

[Stuart Smiles]

Hi Gents,

Thanks for the replies.
We will try them on monday morning.

thanks again

Stuart