Bug 3079 - Ip aliasing/masquerading does not work
Ip aliasing/masquerading does not work
Status: CLOSED NOTABUG
Product: Red Hat Linux
Classification: Retired
Component: macutils (Show other bugs)
6.0
i386 Linux
high Severity high
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Assigned To: David Lawrence
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Depends On:
Blocks:
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Reported: 1999-05-26 21:04 EDT by cwilliams
Modified: 2008-05-01 11:37 EDT (History)
0 users

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 1999-08-28 15:01:47 EDT
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CRM:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description cwilliams 1999-05-26 21:04:25 EDT
I wished to report that IP aliasing, or multi-homing does
not work properly with redhat 6.0.  For instance please see
the scenario below.
ifconfig eth0 inet 10.5.4.254 netmask 255.255.255.0
broadcast
10.5.4.255 <ret>
route add -net 10.5.4.0 netmask 255.255.255.0 eth0
produces an address for a single "user" on my NIC card.
However when I attempt to alias this NIC card as such...
ifconfig eth0:2 inet 10.10.10.10 netmask 255.255.255.0
broadcast
10.10.10.255 <ret>
route add -net 10.10.10.0 netmask 255.255.255.0 eth0:2
I get another logical device that is not annotated  eth0:2
when I type netstat -rn.  yet the configured interface is
eth0:2 when I type ifconfig.  All preivious version of
Redhat have this capability and it is very important to my
work.
The same result is produced when I use the config scripts
located in /etc/sysconfig/network-scripts.  ifconfig from my
box:
eth5      Link encap:Ethernet  HWaddr 00:40:05:41:4B:17
          inet addr:10.5.4.254  Bcast:10.5.4.255
Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0
carrier:0
          collisions:0 txqueuelen:100
          Interrupt:11 Base address:0xec00

eth5:0    Link encap:Ethernet  HWaddr 00:40:05:41:4B:17
          inet addr:10.10.10.10  Bcast:10.10.10.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
Interrupt:11 Base address:0xec00

netstat -rn
10.5.0.254      0.0.0.0         255.255.255.255 UH        0
0
0 eth1
10.5.2.254      0.0.0.0         255.255.255.255 UH        0
0
0 eth3
10.5.4.254      0.0.0.0         255.255.255.255 UH        0
0
0 eth5
10.5.1.254      0.0.0.0         255.255.255.255 UH        0
0
0 eth2
10.5.3.254      0.0.0.0         255.255.255.255 UH        0
0
0 eth4
206.71.183.0    0.0.0.0         255.255.255.224 U         0
0
0 eth0
10.5.4.0        0.0.0.0         255.255.255.0   U         0
0
0 eth5
10.5.1.0        0.0.0.0         255.255.255.0   U         0
0
0 eth2
10.10.10.0      0.0.0.0         255.255.255.0   U         0
0
0 eth5
10.5.0.0        0.0.0.0         255.255.255.0   U         0
0
0 eth1
10.5.3.0        0.0.0.0         255.255.255.0   U         0
0
0 eth4
10.5.2.0        0.0.0.0         255.255.255.0   U         0
0
0 eth3
127.0.0.0       0.0.0.0         255.0.0.0       U         0
0
0 lo
Comment 1 Jay Turner 1999-05-27 10:52:59 EDT
Behavior confirmed in test lab.  Appears as if netstat is simply
truncating the interface designation, as everything functions
correctly with the aliased interface.
Comment 2 Michael K. Johnson 1999-08-28 15:01:59 EDT
This is directly caused by a kernel change -- check the contents of
/proc/net/routes.  It's not something that we can unilaterally change.
It's not precisely a bug; it's a change in behaviour.  Sorry that
it is causing you trouble...

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