A system may have both “public” interface
IP addresses and “private” interface IP addresses.
A public interface IP address is an IP address configured on a Network
Interface Card (NIC) connected to a public network. A private interface
IP address is an IP address configured on a NIC connected to a private
internal network. If you have a system with both a public interface
IP address and a private interface IP address, do not assume that
all packets processed by the private interface originated from the
private network. Do not configure any “open” IPSec
policies that allow most or all packets sent to the private interface
IP address to pass in clear text.
If you configure an open IPSec policy for a private interface
IP address on a system that also has public interfaces, intruders
may be able to access services or ports bound to the private interface
IP address from other NICs on the system, even if the other interface
IP addresses are secured by IPSec policies. Intruders may access
services or ports bound to the private interface IP address, even
if the intruders are not directly connected to the private interface.
Bypass
List |
 |
Configuring an entry in the bypass list has the same effect
as configuring an open IPSec policy, so the same conditions exist.
Intruders may be able to access services or ports bound to the address
in the bypass list from other interfaces on the system, even if
the other interfaces are secured by IPSec policies. Intruders may
access services or ports bound to the address in the bypass list
even if the intruders are not directly connected to the interface
in the bypass list.
HP recommends that you do not configure open IPSec policies,
or entries in the bypass list for private interfaces on systems
that also have public interfaces, or on systems on which you are
using HP-UX IPSec as a filter or firewall to protect your network.
Strong
End System Model |
|
To maximize security when using open policies or the bypass
list, HP recommends that you enable the RFC 1122 Strong End-System
Model. You can do this by entering the following command:
ndd -set /dev/ip ip_strong_es_model 1
You can also enable the RFC 1122 Strong End-System model at
system startup time by editing the /etc/rc.config.d/nddconf file. Refer to the ndd(1M) manpage for more information.
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