[SOLVED] Can't ping localhost

dpayne19 · 2009-04-21 20:02:56

Ever since a fairly large update I haven't been able to ping localhost. When I try to ping localhost or 127.0.0.1 it hangs.

dpayne19 ~ $ ping localhost
PING localhost.localdomain (127.0.0.1) 56(84) bytes of data.

/etc/hosts

#
# /etc/hosts: static lookup table for host names
#

#<ip-address>    <hostname.domain.org>    <hostname>
127.0.0.1     localhost.localdomain    localhost dpayne19-laptop

# End of file

I don't know if this is related but "ping6 ::1" still works fine.

Last edited by dpayne19 (2009-04-22 19:15:12)

.:B:. · 2009-04-21 21:35:36

Ifconfig tells you the loopback interface is up?

This is a recent install (and recent update)? Did you check pacman's output for anything peculiar, any error messages in the various system logs?

Loopback device configuration has been taken out the central configuration script a while ago, so it should be set up automatically (and I've never seen it fail, even when one had to configure it in rc.conf, but there's always a first).

alexandrite · 2009-04-21 22:00:58

I acutally had a problem connecting to localhost, and I solved it by adding the loopback adapter (lo) to the "interfaces" line in rc.conf.

Something like this:

...
INTERFACES=(!eth0 !wlan0 lo)
...

Procyon · 2009-04-21 22:18:57

I added ::1 localhost "hostname" to /etc/hosts, but it didn't solve the ping problem, but mpd works again. I didn't have internet that entire day and thought it was related to that so once it started working I didn't pay further attention to it.

dpayne19 · 2009-04-22 02:21:52

I've tried everything suggested and none if it works.

B:
I checked output from the update. I didn't notice anything about loopback or anything like that, but I may have missed something.

ifconfig

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:1002 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1002 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:57072 (55.7 Kb)  TX bytes:57072 (55.7 Kb)

alexandrite:
I tried adding lo to interfaces as well as trying to configure it in rc.conf with

...
lo="lo 127.0.0.1"
INTERFACES=(eth0 lo)
...

neither of those worked.

Procyon:
If I add

::1 localhost.localdoman localhost dpayne19-laptop

to /etc/hosts I can ping6 localhost, but I still can't ping localhost and mpd still doesn't work.

Last edited by dpayne19 (2009-04-22 02:22:59)

fumbles · 2009-04-22 04:57:04

Are you using any firewall? iptables etc?

decaren · 2009-04-22 05:09:59

make sure your MODULES line in /etc/rc.conf has loop (i.e. MODULES=(loop)

dpayne19 · 2009-04-22 07:04:55

Disabling iptables was the first thing I tried and it doesn't seem to have any effect.
loop is in the MODULES list and lsmod says it has been loaded.

Last edited by dpayne19 (2009-04-22 07:06:35)

robmaloy · 2009-04-22 07:35:02

decaren wrote:

make sure your MODULES line in /etc/rc.conf has loop (i.e. MODULES=(loop)

loop is used to mount files like block devices

JK3mp · 2009-04-22 15:20:29

create another user profile and try again.

brisbin33 · 2009-04-22 16:25:52

you should also check /etc/sysctl.conf for kicks. our stateful firewall wiki recommended adding this:

net.ipv4.icmp_echo_ignore_all = 1

which will make your box invisible to pings (secure!)

of course, with it you can't ping localhost either.

dpayne19 · 2009-04-22 19:11:53

That was it, sorta. After removing

net.ipv4.icmp_echo_ignore_all = 1

from /etc/sysctl.conf I could ping localhost. Mpd still didn't work though, so I removed everything else suggested in the stateful firewall wiki and now everything works fine.

Thanks for all the help!

fukawi2 · 2009-04-22 22:44:24

decaren wrote:

make sure your MODULES line in /etc/rc.conf has loop (i.e. MODULES=(loop)

That won't do a thing to networking... loop is for loop mounting files as devices, not loopback network interface.

decaren · 2009-04-28 04:43:49

fukawi2 wrote:

decaren wrote:
make sure your MODULES line in /etc/rc.conf has loop (i.e. MODULES=(loop)
That won't do a thing to networking... loop is for loop mounting files as devices, not loopback network interface.

Someone should probably correct that in the beginner's guide then. I just remembered it from doing a bunch of installs and reading through the beginners guide a million times last week. Sorry.

fukawi2 · 2009-04-28 05:48:29

Fixed.

MODULES=: Specify additional MODULES if you know that an important module is missing. If your system has any floppy drives, add "floppy". If you will be using loopback filesystems, add "loop". Also specify any blacklisted modules by prefixing them with a bang (!). Udev will be forced NOT to load blacklisted modules. In the example, the IPv6 module as well as the annoying pcspeaker are blacklisted.

JK3mp · 2009-04-29 14:08:25

fukawi2 wrote:

Fixed.
MODULES=: Specify additional MODULES if you know that an important module is missing. If your system has any floppy drives, add "floppy". If you will be using loopback filesystems, add "loop". Also specify any blacklisted modules by prefixing them with a bang (!). Udev will be forced NOT to load blacklisted modules. In the example, the IPv6 module as well as the annoying pcspeaker are blacklisted.

Can u show us the output of ifconfig ?

fukawi2 · 2009-04-29 22:48:02

fukawi2 ~  $ ifconfig lo
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:276752 errors:0 dropped:0 overruns:0 frame:0
          TX packets:276752 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:113634458 (108.3 Mb)  TX bytes:113634458 (108.3 Mb)

What are you getting at?

Arch Linux

#1 2009-04-21 20:02:56

[SOLVED] Can't ping localhost

#2 2009-04-21 21:35:36

Re: [SOLVED] Can't ping localhost

#3 2009-04-21 22:00:58

Re: [SOLVED] Can't ping localhost

#4 2009-04-21 22:18:57

Re: [SOLVED] Can't ping localhost

#5 2009-04-22 02:21:52

Re: [SOLVED] Can't ping localhost

#6 2009-04-22 04:57:04

Re: [SOLVED] Can't ping localhost

#7 2009-04-22 05:09:59

Re: [SOLVED] Can't ping localhost

#8 2009-04-22 07:04:55

Re: [SOLVED] Can't ping localhost

#9 2009-04-22 07:35:02

Re: [SOLVED] Can't ping localhost

#10 2009-04-22 15:20:29

Re: [SOLVED] Can't ping localhost

#11 2009-04-22 16:25:52

Re: [SOLVED] Can't ping localhost

#12 2009-04-22 19:11:53

Re: [SOLVED] Can't ping localhost

#13 2009-04-22 22:44:24

Re: [SOLVED] Can't ping localhost

#14 2009-04-28 04:43:49

Re: [SOLVED] Can't ping localhost

#15 2009-04-28 05:48:29

Re: [SOLVED] Can't ping localhost

#16 2009-04-29 14:08:25

Re: [SOLVED] Can't ping localhost

#17 2009-04-29 22:48:02

Re: [SOLVED] Can't ping localhost

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