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Full Discussion: AIX with 2 Net Interfaces lose connectivity
Operating Systems AIX AIX with 2 Net Interfaces lose connectivity Post 302908844 by karlochacon on Thursday 10th of July 2014 06:36:31 PM
Old 07-10-2014
Quote:
Originally Posted by bakunin
hmm, in 3 you said there is no VIOS, now i am confused. Please describe your (physical and virtual) network setup in detail, from the switch to the kernel.
OK,

AIX-TSM Server is a Power 710, where AIX was installed on top of it. This servers has no VIO.

has two NICs
en0 administration
en1-en2 backup in etherchannel ( anyway without etherchannel we tried as well and the issue is still there just using en1)

Quote:
I don't think this is default. I even suppose this is why you lose connectivity sometimes. If a packet comes in on interface 1 this doesn't necessarily have to answer if two (or more) interfaces are in the same subnet. It could be any other interface in this network too. If your en1 answers and this traffic is routed to the loopback device, the connection would never come to pass.

I suggest you investigate this, IMHO this is the most likely source of the problem.
Good point

Quote:
For a proper routing table you need 3 entries:

1) a default route, telling the system where to send everything for which no rule exists,

2) route directing everything on the "home net" to the interface in the net,

3) a loopback, directing 127/8 to lo0.

For instance: your network on en0 is 10.10.10/24, your IP is 11. Your second network is "10.10.20/24", IP is 11 again. You will need 4 rules for that:


1) default -> nearest router, say, 10.10.10.1
2) 10.10.10/24 -> 10.10.10.11
3) 10.10.20/24 -> 10.10.20.11
4) 127/8 -> 127.0.0.1

I hope this helps.
we might need to take a look at this then
 

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LEARN ABOUT OPENDARWIN

lo

LO(4)							   BSD Kernel Interfaces Manual 						     LO(4)

NAME

     lo -- software loopback network interface

SYNOPSIS

     pseudo-device
     loop

DESCRIPTION

     The loop interface is a software loopback mechanism which may be used for performance analysis, software testing, and/or local communication.
     As with other network interfaces, the loopback interface must have network addresses assigned for each address family with which it is to be
     used.  These addresses may be set or changed with the SIOCSIFADDR ioctl(2).  The loopback interface should be the last interface configured,
     as protocols may use the order of configuration as an indication of priority.  The loopback should never be configured first unless no hard-
     ware interfaces exist.

DIAGNOSTICS

     lo%d: can't handle af%d.  The interface was handed a message with addresses formatted in an unsuitable address family; the packet was
     dropped.

SEE ALSO

     intro(4), inet(4), ns(4)

HISTORY

     The lo device appeared in 4.2BSD.

BUGS

     Previous versions of the system enabled the loopback interface automatically, using a nonstandard Internet address (127.1).  Use of that
     address is now discouraged; a reserved host address for the local network should be used instead.

4.2 Berkeley Distribution					   June 5, 1993 					 4.2 Berkeley Distribution
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