Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

lo(4) [netbsd man page]

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. The loopback interface lo0 is created at boottime, it always exists and cannot be destroyed with ifconfig(8). Additional loopback interfaces can be created by using the ifconfig(8) create command. 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), ifconfig(8) 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. BSD
September 3, 2006 BSD

Check Out this Related Man Page

LO(4)							     Kernel Interfaces Manual							     LO(4)

NAME
lo - software loopback network interface SYNOPSIS
/sys/conf/SYSTEM: NLOOP 1 # loop-back pseudo-device DESCRIPTION
The loop interface is a software loopback mechanism which may be used for performance analysis, software testing, and/or local communica- tion. 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. The loopback interface should be the last interface con- figured, 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. 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(4N), inet(4F), ns(4F) 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. 3rd Berkeley Distribution August 1, 1987 LO(4)
Man Page

15 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Network Ip

Hello again. Neo, thanks for your last reply. I have a new question. How can I re-configure the host name and IP address information attached to my NIC? I remember seeing a command posted here that would cause the system to re-boot and require the information to be entered but I do not see it... (6 Replies)
Discussion started by: jdevarie
6 Replies

2. UNIX for Dummies Questions & Answers

Network configuration in Solaris 8

Hi. I have installed Solaris 8 and I am trying to configure the network settings. For some reason every time I reboot, my card loses its configuration. I can run ifconfig and the only IP address bound to my card (on either interface) is 127.0.0.1. I can change that to a valid IP address on my... (8 Replies)
Discussion started by: Ask Me
8 Replies

3. Solaris

No network interface detected

Hi all, I just install solaris10 at home to learn b4 taking the sun courses. Can't get the internet on my IntelPC. I'm using cable thru SMC ezcard 10/100. I ran ifconfig -a and it only shows lo0. No hme0. Pls help. (9 Replies)
Discussion started by: maag
9 Replies

4. Solaris

Before plumb the network interface.....

I know that I could use the #ifconfig hme0 plumb to activate the network interface. However, how can I know the name of the interface e.g. hme0 before I could use the ifconfig to plumb it up? I know there is a command (but I forgot it) to use in the Sparc version when you are in the... (7 Replies)
Discussion started by: heero
7 Replies

5. Solaris

Network interface not found ?

Hello, I have just installed Solaris 9 x86 in a VMWare and the 1st problem I have is to enable the networking. I can only see the loopback interface and nothing else. - I dont have any /etc/hostnames.xxx - ifconfig -a shows only the loopback - kstat -c net shows only the loopback ... Any... (11 Replies)
Discussion started by: Tex-Twil
11 Replies

6. IP Networking

/etc/hosts changes when ifconfig......

Hello everyone. Im using last redhat enterprise edition and in my working environment, i'm always reconfiguring both interfaces , eth0 and eth1, everytime i change any interface, (i use ifconfig to change ip, and after i execute "/etc/init.d/network restart") my "/etc/hosts" file... (9 Replies)
Discussion started by: trutoman
9 Replies

7. Solaris

Whats the syntax for 'cut' in following?

Guys I am trying to get all physical plus logical interfaces on a host to pass them to a 'for' loop. 'ifconfig -a' gives me all interfaces like following...i need to cut last ':' from this list.What 'cut' syntax i need to use? bash-2.05$ ifconfig -a|awk '{print $1}'|sort|uniq|egrep -v... (13 Replies)
Discussion started by: ak835
13 Replies

8. UNIX for Advanced & Expert Users

'ifconfig' to skip loopback IPs

I generally use /usr/sbin/ifconfig -a | grep "inet" |egrep -v "inet6|0.0.0.0|192.168.100.2"|awk '{print $2}' to capture IPs on a host. Now here is what i have: bash-2.05$ /usr/sbin/ifconfig -a lo0: flags=1000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4> mtu 8232 index 1 inet <IP>... (7 Replies)
Discussion started by: ak835
7 Replies

9. AIX

How restart the network interface in AIX?

Hi All, Please let me know the command to restart the network interface and enable it on boot in AIX, similar to /etc/init.d/network restart in Redhat. Thanks, Sunil.K please watch out to post in the right subforum! (9 Replies)
Discussion started by: sunilrk07
9 Replies

10. Solaris

Network interface problem

Hi i have replace a NIC card on solaris 10 when i give the following command ifconfig -a it just show the lo0 (only loop back with inet 127.0.0.1) when i give the following command to config the interface, ifconfig elxl0 plumb ifconfig: plumb: elxl0: no such interface please help... (11 Replies)
Discussion started by: malikshahid85
11 Replies

11. Shell Programming and Scripting

Array output through a for loop problematic with multiple elements.

This code works perfect when using a machine with only one interface online. (Excluding the loopback of course) But when I have other interface up for vmware or a vpn the output gets mixed up. I know I had this working when I was just reading ip's from files so I know it is not a problem with... (8 Replies)
Discussion started by: Azrael
8 Replies

12. AIX

xp to aix - telnet blank screen

hello, i am trying to test connection to a 5.3 box. from an xp machine, telnet connects but shows only a blank screen. cursor moves as i type, but no response back. have used telnet, putty and accuterm - all same result verified that telnet services are active in xp xp windoze firewall is... (10 Replies)
Discussion started by: allenhibbert
10 Replies

13. HP-UX

Are you allowed to use the same vswitch for 2 separate HPVMs?

Can you use the same vswitch for multiple HPVMs? The reason I ask is because I created a vswitch and assigned it to one hpvm, and I was able to get it on the network. Then I created a second hpvm and used the same vswitch, and I am able to ssh/sftp TO the second hpvm, but I am unable to ping... (8 Replies)
Discussion started by: bstring
8 Replies

14. Shell Programming and Scripting

Using sed or awk

I have a .txt file with almost few hundreds interfaces address which need to be changed or mapped to the new interface naming convention. for e.g interface xe-8/0/0 should be xe-16/0/0 xe-9/0/0 should be xe-17/0/0 it keeps going to xe-31/0/0 which should become xe-55/0/0. i wanted to know... (12 Replies)
Discussion started by: Jared
12 Replies

15. Solaris

Configure dual stack on existing Solaris 10

I have a Solaris 10 server with the following interfaces: ifconfig -a lo0: flags=2001000849<UP,LOOPBACK,RUNNING,MULTICAST,IPv4,VIRTUAL> mtu 8232 index 1 inet 127.0.0.1 netmask ff000000 e1000g0: flags=209040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER,CoS> mtu 1500 index... (8 Replies)
Discussion started by: e_mikey_2000
8 Replies