Loopback interface performance...

Hi all,
I've got an application that runs in a Solaris box. During application cycles, it needs to make internal call to itself (web-Services based architecture) and until now they were using the Internet IP of the box (hme0 interface).
Would it not be better to use the loopback interface (lo0) for internal connections instead of using the normal internet interface (hme0) ?
Is the loopback interface more suitable for this purpose ? is it scalable enough ?
our ifconfig as follows :
hme0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 1
inet 192.168.0.6 netmask ffffff00 broadcast 192.168.0.255
hme2: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 129.157.66.18 netmask ffff0000 broadcast 129.157.255.255
hme2:1: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
inet 129.157.66.28 netmask ffff0000 broadcast 129.157.255.255
lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 3
inet 127.0.0.1 netmask ff000000
Thanks in advance.
Nicolas

The loopback interface address of 127.0.0.1 seems to work well:
sd-6:/tmp
root:=> mkfile 100m test
sd-6:/tmp
root:=> ftp 127.0.0.1
Connected to 127.0.0.1.
220 sd-6 FTP server ready.
Name (127.0.0.1:root): root
331 Password required for root.
Password:
230-Please read the file README.pdf
230- it was last modified on Wed Dec 15 15:26:58 2004 - 39 days ago
230 User root logged in.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> bin
200 Type set to I.
ftp> cd /tmp
250 CWD command successful.
ftp> get test test2
200 PORT command successful.
150 Opening BINARY mode data connection for test (104857600 bytes).
226 Transfer complete.
local: test2 remote: test
104857600 bytes received in 2 seconds (50724.56 Kbytes/s)
ftp>

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Baseline template - look for specific loopback interface when specifying "ip tftp source-interface"

Hello all
I'm new to regex and I'm trying to make a baseline template, that will check our network devices for our required basic configuration.
What I'm trying to do is to make a template that will look for either a loopback0 or loopback1 interface.
If eíther one is found (the loopback interfaces will not be there at the same time) it must apply the following command:
ip tftp source-interface loopback0 (or loopback1)
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Message was edited by: Jesper Ross Petersen

Yes, this can be done
#Go to the tcl shell of the device.
C1811#tclsh
C1811(tcl)#
#copy and paste this at the tcl prompt.
proc intf {} {
set runningcfg [exec show run | inc ^interface Loopback]
foreach line [split $runningcfg \n] {
if {[regexp {interface (Loopback[0-1])} $line -> interface] } {
ios_config "ip tftp source-interface $interface"
return "ip tftp source-interface $interface"
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ip tftp source-interface Loopback0
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Missing loopback interface and modules, and isofs mounting [SOLVED!]

In my new archlinux istallation, isofs and loopback facilities are not present and when installed by hand do not seem to work. [See FINAL SOLUTION below. Thanks for the suggestions I got].
Now, I was under the impression that such facilities should be automatically available at the end of a normal installation.
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loop 18526 2
isofs 32946 1
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I mentioned above that in my older Linux box, on an Arch Linux installed months ago but not upgraded for many weeks, I had loopback devices running and isofs and loop modules installed, and all working well by itself. Today I did an upgrade, and noticed that it came with a new kernel (3.3?), probably the same I had on the new machine. So I rebooted after that---and found the exact problem as on the new machine: /dev/loop* missing, no modules isofs or loop appearing in lsmod. So I installed by hand a loopback interface, with 'mknod /dev/loop0 b 7 0'. Then I made sure I had the isofs package installed, and installed the isofs module with modprob; this time isofs showed on lsmod, but loop didn't yet. Finally I mounted a data DVD (note that the incantation -t iso9660 is no longer necessary), and as a last thing I mounted an .iso file; both worked. Only after this did a module loop show up in lsmod.
So probably something subtle changed in the dependencies between installed packages, installed modules, and installed loopback devices, so that something is out of sync and has to be nursed manually. Better experts than I may throw
some light on this problem and hopefully fix it.
FINAL AND SATISFACTORY SOLUTION
Whatever may have happened before, the following works like a charm:
I upgrade Arch; it installs 3.3.1-1-ARCH as a kernel in /boot.
I reboot to let the new kernel "take".
No loop0,...,loop7 devices show up in /dev; no isofs or loop show up with lsmod; isofs (but no loop) present in /lib/modules
I do 'mount /dev/sr0 /iso' (NOTE: no -t iso9660' option) with a CD in the sr0 drive; the CD filesystem shows up in /iso.
After this, isofs shows up in 'lsmod|grep isofs', but no loop device yet.
I unmount /iso and do 'mount ~tt/ markov.iso /iso' (NOTE: no -t iso9660' option); the markov filesystem shows up in /iso.
After this, loop0,...,loop7 devices show up in /dev, and a loop module (wherever that camefrom) appears in lsmod.
In other words, everything required for isofs automounts as necessary and remains mounted until new reboot.
The '-t iso9660' option is not necessary. As noted by an other Arch post, this option may be detrimental and might have been the culprit; this is an issue I will explore on the next reboot.
Last edited by rugantino (2012-04-11 20:11:55)

When /etc/rc.sysinit is invoked during the bootprocess; it should automatically start a loopback interface (unless you've specifically disabled it in /etc/rc.d/network or so).
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Crypto Map on Loopback interface or Physical Interface

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http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/23862-duplicate-router-id-ospf.html
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I do not understand whether your question is asking how you configure a loopback interface or whether you are asking how you configure OSPF to process on the loopback interface.
A loopback interface is a virtual interface on a router. You assign an IP address to the loopback interface much as you would assign an address on a physical interface. The subnet mask for the loopback interface can be a normal subnet mask or it could be a host specific /32 mask (255.255.255.255). What mask to use depends on how your network is designed.
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Loopback Interface

What is the purpose of the loopback interface?

Sherman
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How to configure snmp on loopback interface, on vrf TEST, in ASR 9000 series

Hi there!
How to configure snmp v2, with community string, for ASR 9000 series, in interface loopback 1, that has vrf TEST
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oh that is somewhat vague, but let me try...
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1. All of my media was located on the SSD installed inside the Mac Pro and is the startup disk of the computer
This will slow you down. Get a secondary drive for the media and Libraries.
2. The SSD had between 50g and 150g (depending on the project) available
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Loopback interface performance...

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