IBM Support

Allowing TCP/IP Packets to Go Out the Same Interface They Came In

Troubleshooting


Problem

This document contains the steps to configure TCP/IP routes to allow TCP/IP packets to go out the same interface they came in.

Resolving The Problem

Packets coming in a certain interface may go out a different interface depending on the routes configured.

To have inbound traffic that comes in one interface and goes out the same interface, configure multiple redundant routes, each bound to a different interface.

This will help inbound-initiated traffic only (when the IBM System i system is the server).
 
Display TCP/IP Route                            
                                                            System:   AS400A
Route destination  . . . . . . . . . . :   *DFTROUTE                          
Subnet mask  . . . . . . . . . . . . . :   *NONE                              
Type of service  . . . . . . . . . . . :   *NORMAL                            
Next hop . . . . . . . . . . . . . . . :   10.10.186.1                          
Preferred binding interface  . . . . . :   10.10.186.25                        
Maximum transmission unit  . . . . . . :   *IFC                                
Duplicate route priority . . . . . . . :   5                                  
Route metric . . . . . . . . . . . . . :   1                                  
Route redistribution . . . . . . . . . :   *NO                               
 
   Display TCP/IP Route                            
                                                            System:   AS400A
Route destination  . . . . . . . . . . :   *DFTROUTE                          
Subnet mask  . . . . . . . . . . . . . :   *NONE                              
Type of service  . . . . . . . . . . . :   *NORMAL                            
Next hop . . . . . . . . . . . . . . . :   10.10.186.1                          
Preferred binding interface  . . . . . :   10.10.186.30                        
Maximum transmission unit  . . . . . . :   *IFC                                
Duplicate route priority . . . . . . . :   5                                  
Route metric . . . . . . . . . . . . . :   1                                  
Route redistribution . . . . . . . . . :   *NO                            

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Historical Number

19213710

Document Information

Modified date:
03 June 2024

UID

nas8N1017813

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