"ping localhost" return a valid IP address, well at least not 127.0.0.1

vbekker · 11-21-2010, 04:18 AM

Hi,
I apologize in advance if this already came up on any other threads, i was not able to locate any similar ones.

When i ping localhost:

Code:

[root@confluence conf]# ping localhost
PING localhost.localdomain (208.68.143.55) 56(84) bytes of data.
64 bytes from 208.68.143.55: icmp_seq=1 ttl=113 time=78.6 ms
64 bytes from 208.68.143.55: icmp_seq=2 ttl=113 time=77.2 ms
64 bytes from 208.68.143.55: icmp_seq=3 ttl=113 time=76.7 ms
64 bytes from 208.68.143.55: icmp_seq=4 ttl=113 time=80.4 ms
64 bytes from 208.68.143.55: icmp_seq=5 ttl=113 time=76.9 ms

Also the output of route:

Code:

[root@confluence conf]# route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     *               255.255.255.0   U     0      0        0 eth0
169.254.0.0     *               255.255.0.0     U     0      0        0 eth0
default         DD-WRT          0.0.0.0         UG    0      0        0 eth0
[root@confluence conf]# ping DD-WRT
PING DD-WRT.localdomain (208.68.143.55) 56(84) bytes of data.
64 bytes from 208.68.143.55: icmp_seq=1 ttl=113 time=77.0 ms
64 bytes from 208.68.143.55: icmp_seq=2 ttl=113 time=80.7 ms
64 bytes from 208.68.143.55: icmp_seq=3 ttl=113 time=78.3 ms

druuna · 11-21-2010, 04:36 AM

Hi,

I don't see an actual question in the above post....

I do see one thing that doesn't look correct: localhost / localhost.localdomain should point to 127.0.0.1 by convention and it should not point to an outside location (as in the posted output).

What does you /etc/hosts file look like? There should be an entry like this present: 127.0.0.1 localhost.localdomain localhost and both localhost and localhost.localdomain should only be mentioned once.

Hope this helps.

jefro · 11-21-2010, 12:04 PM

Does hosts file contain localhost 127.0.0.1

Is loopback adapter enabled?

vbekker · 11-21-2010, 12:37 PM

Code:

[root@localhost ~]# cat /etc/hosts
# Do not remove the following line, or various programs
# that require network functionality will fail.
127.0.0.1               localhost.localdomain localhost
::1             localhost6.localdomain6 localhost6
[root@localhost ~]#

vbekker · 11-21-2010, 12:39 PM

What's weird i can ping "dnjlskdjflksdjlfksjdlf" or some random string of characters and get a response like this:

Code:

[root@localhost ~]# ping kajsdlkaldklsakdsa
PING kajsdlkaldklsakdsa.localdomain (208.68.143.55) 56(84) bytes of data.
64 bytes from 208.68.143.55: icmp_seq=1 ttl=113 time=80.8 ms
64 bytes from 208.68.143.55: icmp_seq=2 ttl=113 time=80.1 ms
64 bytes from 208.68.143.55: icmp_seq=3 ttl=113 time=78.0 ms

vbekker · 11-21-2010, 12:41 PM

Quote:

Originally Posted by druuna

Hi,

I don't see an actual question in the above post....

Hi,
The question is why am i getting such strange results from ping? Perhaps there is simple misconfiguration somewhere?

eSelix · 11-21-2010, 03:02 PM

And what is result of:

Code:

host -v localhost
host -v dnjlskdjflksdjlfksjdlf

druuna · 11-21-2010, 03:10 PM

Hi,

Can you also post the following:

- Content of /etc/resolv.conf
- Content of /etc/nsswitch.conf
- Output of route -n

Looks like all your request are send to the outside world by means of asking your modem/router. Maybe the asked output can shed some light on the problem.

frankbell · 11-21-2010, 08:05 PM

Just for grins and giggles, I did a whois 208.68.143.55.

It appears to be a moving firm in Needham, Mass., USA:

Code:

NetRange:       208.68.136.0 - 208.68.143.255
CIDR:           208.68.136.0/21
OriginAS:       AS40066
NetName:        FAST-HOSTED-SERVICES
NetHandle:      NET-208-68-136-0-1
Parent:         NET-208-0-0-0-0
NetType:        Direct Assignment
NameServer:     DNSBOSEXT.FASTSEARCH.NET
NameServer:     DNSDENEXT.FASTSEARCH.NET
RegDate:        2006-06-28
Updated:        2008-04-11
Ref:            http://whois.arin.net/rest/net/NET-208-68-136-0-1

OrgName:        FAST Search & Transfer Inc
OrgId:          FST-20
Address:        117 Kendrick Street
City:           Needham
StateProv:      MA
PostalCode:     02494
Country:        US
RegDate:        2006-05-04
Updated:        2006-05-04
Ref:            http://whois.arin.net/rest/org/FST-20

OrgTechHandle: JHH10-ARIN
OrgTechName:   Hutchinson, James Henry
OrgTechPhone:  +1-781-433-8999 
OrgTechEmail:  james.hutchinson@microsoft.com
OrgTechRef:    http://whois.arin.net/rest/poc/JHH10-ARIN

RTechHandle: JHH10-ARIN
RTechName:   Hutchinson, James Henry
RTechPhone:  +1-781-433-8999 
RTechEmail:  james.hutchinson@microsoft.com
RTechRef:    http://whois.arin.net/rest/poc/JHH10-ARIN

vbekker · 11-21-2010, 08:21 PM

Quote:

Originally Posted by eSelix

And what is result of:

Code:

host -v localhost
host -v dnjlskdjflksdjlfksjdlf

Same output for both:

Code:

[root@localhost ~]# host -v localhost
Trying "localhost.localdomain"
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 18786
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;localhost.localdomain.         IN      A

;; ANSWER SECTION:
localhost.localdomain.  10      IN      A       208.68.143.55

Received 76 bytes from 192.168.1.1#53 in 36 ms
Trying "localhost.localdomain"
Host localhost.localdomain not found: 3(NXDOMAIN)
Received 114 bytes from 192.168.1.1#53 in 11 ms
Trying "localhost.localdomain"
Host localhost.localdomain not found: 3(NXDOMAIN)
Received 114 bytes from 192.168.1.1#53 in 11 ms
[root@localhost ~]#

vbekker · 11-21-2010, 08:23 PM

Quote:

Originally Posted by druuna

Hi,

Can you also post the following:

- Content of /etc/resolv.conf
- Content of /etc/nsswitch.conf
- Output of route -n

Looks like all your request are send to the outside world by means of asking your modem/router. Maybe the asked output can shed some light on the problem.

Code:

[root@localhost ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0 eth0
[root@localhost ~]#

Code:

[root@localhost ~]# cat /etc/resolv.conf 

nameserver 192.168.1.1
search localdomain
[root@localhost ~]#

Code:

[root@localhost ~]# cat /etc/nsswitch.conf
#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Legal entries are:
#
#       nisplus or nis+         Use NIS+ (NIS version 3)
#       nis or yp               Use NIS (NIS version 2), also called YP
#       dns                     Use DNS (Domain Name Service)
#       files                   Use the local files
#       db                      Use the local database (.db) files
#       compat                  Use NIS on compat mode
#       hesiod                  Use Hesiod for user lookups
#       [NOTFOUND=return]       Stop searching if not found so far
#

# To use db, put the "db" in front of "files" for entries you want to be
# looked up first in the databases
#
# Example:
#passwd:    db files nisplus nis
#shadow:    db files nisplus nis
#group:     db files nisplus nis

passwd:     files
shadow:     files
group:      files

#hosts:     db files nisplus nis dns
hosts:      files dns

# Example - obey only what nisplus tells us...
#services:   nisplus [NOTFOUND=return] files
#networks:   nisplus [NOTFOUND=return] files
#protocols:  nisplus [NOTFOUND=return] files
#rpc:        nisplus [NOTFOUND=return] files
#ethers:     nisplus [NOTFOUND=return] files
#netmasks:   nisplus [NOTFOUND=return] files     

bootparams: nisplus [NOTFOUND=return] files

ethers:     files
netmasks:   files
networks:   files
protocols:  files
rpc:        files
services:   files

netgroup:   nisplus

publickey:  nisplus

automount:  files nisplus
aliases:    files nisplus

[root@localhost ~]#

frankbell · 11-21-2010, 08:30 PM

It's been a couple of years since I played with CentOS, but this link leads me to think that you may want to take a look at this file:

/etc/sysconfig/networking/devices/ifcfg-ethx

I'm not sure, but the x in ethx may represent the connection (eth0, eth1, etc.)

vbekker · 11-21-2010, 09:08 PM

Hi frankbell,
This file is used to set parameters for an interface, here is what i have in there:

Code:

# VMware VMXNET3 Ethernet Controller
DEVICE=eth0
BOOTPROTO=static
ONBOOT=yes
HWADDR=00:0c:29:30:49:0a
IPADDR=192.168.1.33
GATEWAY=192.168.1.1
NETMASK=255.255.255.0

frankbell · 11-21-2010, 09:35 PM

So I'm guessing the computer has a static ip address of 192.168.1.33?

How about the contents of the hosts file (it's normally /etc/hosts, but I can't speak for sure about CentOS)?

Here's the relevant lines from one of mine with a static ip address (with "localdomain" substituted for my actual local domain name--I name all my computers after sea creatures):

Code:

127.0.0.1	localhost
127.0.1.1	[localdomain]	tuna
192.168.1.5     [localdomain]   tuna

The second line might be redundant, but I left it in there.

(The rest of my hosts file is a bunch of redirects for tracking cookings that I got from here to redirect them to 127.0.0.1.)

tommyttt · 11-22-2010, 01:15 AM

Quote:

[root@localhost ~]# cat /etc/resolv.conf

nameserver 192.168.1.1
search localdomain
[root@localhost ~]#

This indicates the DNS(nameserver) is on your gateway. Is that correct? Are you providing your own DNS? If not, the nameserver needs to point to your DNS provider.

Tom