Cluster I/O Protocols (CIP) Configuration and Management Manual (H06.16+, J06.05+)

Remote Sockets
Conventional TCP/IP is a process and can receive socket requests from remote NonStop systems.
NonStop TCP/IPv6 does not support this feature, nor does CIP. The EXPANDSECURITY MON
attribute is only useful if remote sockets are supported and hence is not supported in CIP.
New Error Codes when Using IPSec
If IPSec is being used, there might be some new error codes:
• EAGAIN is returned if there is no security association (SA) already established and an SA
setup is started between CIP and the client. (The connect receives an EAGAIN error.) The next
connect that is done after the SA is established works fine.
• ESRCH is returned if the policy says that IPSec must be used, no keys have been entered
manually, and racoon is not running.
Avoiding Interfaces With Link Pulse Down
For J06.04 to J06.09 and H06.16 to H06.20, conventional TCP/IP and NonStop TCP/IPv6 only
select interfaces that have link pulse up for sending connections or data. CIP does not check for
link pulse when selecting interfaces. If there are two interfaces (for example, eth2 and eth3)
configured on the same subnet, and one interface loses link pulse, it is possible that the IP CLIM
will choose the interface that has link pulse down to send packets to that subnet. To avoid this
behavior, either have the interface configured for failover or take the interface down (ifstop).
Figure 24: Two Interfaces Connected To The Same Subnet (page 185) and Figure 25: Two CLIMs
Connected to the Same Subnet (page 186) show configurations that may encounter routing problems.
Figure 24: Two Interfaces Connected To The Same Subnet shows subnet routes with these
characteristics:
• There are two interfaces on the same IP subnet (A.0)
• Both interfaces have the same subnet route to the network
• eth3 is activated first (non-deterministic)
• The subnet route on eth3 is used for all outgoing connections to the network
• The route through eth3 continues to be used even after it has lost link pulse
The network becomes unreachable from a CLIM.
184 IP CIP Migration, Compatibility and Operational Differences