topic Problems with certain IPB4s in Operating System - HP-UX

Problems with certain IPB4s

bgawert — Sun, 10 Feb 2002 22:19:28 GMT

I have an E35 running HP-UX 11.00. Everything works ok except the network. I need to set the machine to 10.0.0.250, but whenever I assign this IP to the LAN interface it doesn??t work. When I use 192.168.0.250 instead it works. Changing Subnet mask didn??t help. Only assigning a second logical IP to a 192.x.x.x IP let??s me use 10.x.x.x. I heard that old HP-UX 11 releases can??t handle 10.x.x.x IP??s. Is this true, and is there a patch for it? I had no problems with 10.20 and a 10.x.x.x IP. Benjamin

Re: Problems with certain IPB4s

Patrick Wallek — Sun, 10 Feb 2002 22:39:55 GMT

Is this machine directly attached to the Internet, or are you trying to route traffic from this machine to the Internet?

If so, it won't work.

See this document from the TKB:

What are the IP addresses that are reserved for private intranets?

DocId: NR0200KBRC00001839

Updated: 4/3/00 7:32:58 AM

PROBLEM

What IP addresses for private intranets that are non-routable over the Internet?

RESOLUTION

There are 3 address ranges reserved for private intranets. These address ranges
are non-routable over the Internet. The address ranges are:

10.x.x.x - Class A
172.16.x.x - 172.31.x.x - Class B
192.168.x.x - Class C

Re: Problems with certain IPB4s

harry d brown jr — Sun, 10 Feb 2002 23:31:15 GMT

Benjamin,

You state that you heard older release 11's couldn't handle 10.x.x.x addresses, yet it
seems you just loaded 11 on your E35, correct? What was the release date of your install disks? And have you patched your system, if not use the custom patch manager?

I've never had a problem setting my internal servers to 10.x.x.x addresses. What was the mask you used for 10.0.0.250?

Also, what are your router rules? Does it allow 10.x.x.x addresses?

live free or die
harry

Re: Problems with certain IPB4s

Steven Sim Kok Leong — Mon, 11 Feb 2002 01:07:58 GMT

Hi,

It depends on whether you have an intermediate NAT (network address translation) device which allows you to route traffic with private IP addresses across a public network (with public IPs) by translating from private to public addressing.

Hope this helps. Regards.

Steven Sim Kok Leong

Re: Problems with certain IPB4s

Wodisch — Mon, 11 Feb 2002 01:08:30 GMT

Hello Benjamin,

you tried a netmask other than "255.0.0.0" with that 10-address, right?
I do remember problems like that, and the real solution were some patches...
But the workaround (read: botch) was to use the wrong netmask first, and then as a second set of parameters the real netmask.

Go for the current set of networking patches!

Just my $0.02,
Wodisch

Re: Problems with certain IPB4s

Ron Kinner — Mon, 11 Feb 2002 03:10:03 GMT

You don't give the masks involved but you could be running into the subnet zero problem. The RFC reserves bottom and top subnets for the network designation and network broadcast. I understand HP normally inforces this rule but the inforcement can be turned off.

Example: 10.0.0.250 is a legal address if the mask is 255.0.0.0 but if you use a class C mask of 255.255.255.0 then 10.0.0.250 is in the bottom (zero) subnet which is reserved and you are not supposed to have a host in that subnet. Does it allow you to assign 10.1.1.250?

Ron