loopback in AIX server

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loopback in AIX server


I´ve a problem in a AIX server because is generating a loopback in its own ip address and this are consuming all the bandwidth.

I did many things trying to solve the problem but it doesn´t help.
1. Flush Routing tables
2. Get Up/Down Network interface
3. Add/remove Network Interface

amtl04<root> netstat -nr
Routing tables
Destination Gateway Flags Refs Use Interface
(0) 0 ff00
(0) 0 ffff
(0) 0 ffff ffff

Route Tree for Protocol Family 2:
default UG 0 0 en0
10 UG 0 0 en0
10.1 UG 0 9417 en0
10.8 UG 0 62 en0
10.9 UG 7 135206 en0
10.9.20 U 14 148032 en0 UG 0 0 en0 UG 7 3891440 en0 UG 0 0 en0
127 U 4 366 lo0

amtl04<root> netstat -ni
Name Mtu Network Address Ipkts Ierrs Opkts Oerrs Coll
lo0 16896 <Link> 381 0 688 0 0
lo0 16896 127 381 0 688 0 0
en0 1500 <Link>2.60.8c.e8.d9.b9 4484838 0 4184618 0 0
en0 1500 10.9.20 4484838 0 4184618 0 0

amtl04<root> traceroute amtl04
traceroute to amtl04 (, 30 hops max, 40 byte packets
1 ( 2 ms 2 ms 2 ms
2 amtl04 ( 3 ms 2 ms 2 ms

Please somebody help me with this issue.

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

lo -- software loopback network interface SYNOPSIS
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 with the appropriate ioctl(2) commands for corresponding address families. 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 hardware interfaces exist. If the transmit checksum offload capability flag is enabled on a loopback interface, checksums will not be generated by IP, UDP, or TCP for packets sent on the interface. If the receive checksum offload capability flag is enabled on a loopback interface, checksums will not be validated by IP, UDP, or TCP for packets received on the interface. By default, both receive and transmit checksum flags will be enabled, in order to avoid the overhead of checksumming for local communication where data corruption is unlikely. If transmit checksum generation is disabled, then validation should also be disabled in order to avoid packets being dropped due to invalid checksums. 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
inet(4), intro(4) HISTORY
The lo device appeared in 4.2BSD. The current checksum generation and validation avoidance policy appeared in FreeBSD 8.0. BSD
January 25, 2012 BSD

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