Ping Hosts by Name not Working 14.2

jcamez · 08-03-2016, 08:01 PM

Hi guys!!

I have a problem with Slackware 14.2.

In 14.1 i could ping other conmputers in my lan by its host name instead of the ip.

I added "wins" to the line "hosts: files dns" in /etc/nsswitch.conf. and "yes" to the line "wins support =" in /etc/samba/smb.conf.

But now in 14.2, after making this changes, i still can't ping hosts by its name, and because i use dhcp i have to find the ip in each host so i can acces with remote clients or share files.

Any one has seen this en 14.2??

Thanks in advance.

bassmadrigal · 08-03-2016, 08:27 PM

I know this doesn't solve your problem, but another option might be found within your router. Many routers will allow you to assigned "static" IPs through the dhcp based on the MAC address (on my router running dd-wrt, it is called "static leases" and is found under the "Services" tab). I put in my computer's MAC address into the router and pick an IP within the valid range, then when I use dhcp on my computer, my computer will get the IP I told the router.

I have this for all my computers except for my wife's iPhone (since I never need to connect to that).

With that being said, hopefully someone else can help you figure out the name problem.

zk1234 · 08-04-2016, 03:19 AM

1) Make sure that you have your router's dynamic IP in /etc/resolv.conf. If, for example, you have 8.8.8.8 there, then obviously Google knows nothing about your internal home network (at least I hope so :-)
2) Alternatively, you can also edit /etc/hosts by adding new lines to this file, for example:
192.168.1.7 teddy.laptop

.

Darth Vader · 08-04-2016, 05:23 AM

Just leaving there:

Code:

bash-4.3# ping http://www.google.com
ping: unknown host http://www.google.com
bash-4.3#

That's on a bare installation of Slackware 14.2 on a Virtual Machine, where you can perfectly access the Google on Firefox or Konqueror. No more than a VM because looks like all my existent computers have strong opinions against this release and there are no money and will to buy yet another one, wondering if it will work with.

PS. I would like to say Sorry!!! if this console excerpt insult someone!

allend · 08-04-2016, 06:49 AM

Funny how 'ping' fails on port 80.

Perhaps 'ping -c2 www.google.com'?

Darth Vader · 08-04-2016, 06:58 AM

Quote:

Originally Posted by allend

Funny how 'ping' fails on port 80.

Perhaps 'ping -c2 www.google.com'?

Code:

bash-4.3# ping https://www.google.com
ping: unknown host https://www.google.com
bash-4.3# 

bash-4.3# ping -c2 https://www.google.com
ping: unknown host https://www.google.com
bash-4.3#

PS. I would like to say Sorry!!! if this console excerpt insult someone!

allend · 08-04-2016, 07:03 AM

I am not insulted, merely amused.

P.S. Consider TCP versus ICMP

Darth Vader · 08-04-2016, 07:10 AM

Oh, again, sorry!

Code:

bash-4.3# ping www.google.com
ping: unknown host www.google.com
bash-4.3#

That's better?

allend · 08-04-2016, 07:40 AM

Quote:

bash-4.3$ ping -c2 www.google.com
PING www.google.com (172.217.25.164) 56(84) bytes of data.
64 bytes from www.google.com (172.217.25.164): icmp_seq=1 ttl=52 time=16.8 ms
64 bytes from www.google.com (172.217.25.164): icmp_seq=2 ttl=52 time=15.7 ms

--- www.google.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 15.702/16.251/16.800/0.549 ms

No problem with DNS here.

Richard Cranium · 08-04-2016, 09:12 PM

What does "ping" have to do with DNS lookup anyways?

Code:

cranium@toshiba:~$ host www.google.com
www.google.com has address 74.125.21.103
www.google.com has address 74.125.21.106
www.google.com has address 74.125.21.104
www.google.com has address 74.125.21.105
www.google.com has address 74.125.21.99
www.google.com has address 74.125.21.147
www.google.com has IPv6 address 2607:f8b0:4002:c06::69
cranium@toshiba:~$ uname -a
Linux toshiba 4.4.14 #1 SMP Fri Jun 24 13:30:15 CDT 2016 x86_64 Intel(R) Pentium(R) CPU B940 @ 2.00GHz GenuineIntel GNU/Linux
cranium@toshiba:~$

allend · 08-05-2016, 03:54 AM

Quote:

What does "ping" have to do with DNS lookup anyways?

Code:

bash-4.3$ cat /etc/resolv.conf
# Generated by NetworkManager
nameserver 211.29.132.12
nameserver 198.142.0.51

and excerpt from /strace ping -c2 www.google.com'

Code:

socket(PF_INET, SOCK_DGRAM|SOCK_NONBLOCK, IPPROTO_IP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(53), sin_addr=inet_addr("211.29.132.12")}, 16) = 0

kjhambrick · 08-05-2016, 04:25 AM

jcamez --

Since you mentioned WINS in your original post, I have to ask ...

Is smb running on the 14.2 box ?

Code:

ps -ef |grep smb

Or do you have a firewall running ?

If so, I believe WINS wants to chat on port 137 {?}

HTH

-- kjh

jcamez · 08-05-2016, 02:32 PM

Quote:

Originally Posted by bassmadrigal

I know this doesn't solve your problem, but another option might be found within your router. Many routers will allow you to assigned "static" IPs through the dhcp based on the MAC address (on my router running dd-wrt, it is called "static leases" and is found under the "Services" tab). I put in my computer's MAC address into the router and pick an IP within the valid range, then when I use dhcp on my computer, my computer will get the IP I told the router.

I have this for all my computers except for my wife's iPhone (since I never need to connect to that).

With that being said, hopefully someone else can help you figure out the name problem.

Hi bassmadrigal.
I want to leave that as a last resort.

It really confuses me why it was working in 14.1 and not working in 14.2 making the same changes.
What has changed??

thanks.

jcamez · 08-05-2016, 02:34 PM

Quote:

Originally Posted by zk1234

1) Make sure that you have your router's dynamic IP in /etc/resolv.conf. If, for example, you have 8.8.8.8 there, then obviously Google knows nothing about your internal home network (at least I hope so :-)
2) Alternatively, you can also edit /etc/hosts by adding new lines to this file, for example:
192.168.1.7 teddy.laptop

.

1) My /etc/resolv.conf shows the corresponding lines of my router.

" ##Generated by NetworkManager
nameserver 200.52.162.137
nameserver 200.52.160.200
nameserver 200.77.146.137 "

2) i have think of that, but then i would have to add a line every time my ip changes right??

Thanks.

jcamez · 08-05-2016, 02:36 PM

Quote:

Originally Posted by Darth Vader

Just leaving there:

Code:

bash-4.3# ping http://www.google.com
ping: unknown host http://www.google.com
bash-4.3#

That's on a bare installation of Slackware 14.2 on a Virtual Machine, where you can perfectly access the Google on Firefox or Konqueror. No more than a VM because looks like all my existent computers have strong opinions against this release and there are no money and will to buy yet another one, wondering if it will work with.

PS. I would like to say Sorry!!! if this console excerpt insult someone!

Pinging google works ok..

Code:

bash-4.3# ping www.google.com
PING www.google.com (173.194.219.99) 56(84) bytes of data.
64 bytes from ya-in-f99.1e100.net (173.194.219.99): icmp_seq=1 ttl=41 time=109 ms
64 bytes from ya-in-f99.1e100.net (173.194.219.99): icmp_seq=2 ttl=41 time=108 ms
64 bytes from ya-in-f99.1e100.net (173.194.219.99): icmp_seq=3 ttl=41 time=109 ms
64 bytes from ya-in-f99.1e100.net (173.194.219.99): icmp_seq=4 ttl=41 time=109 ms
64 bytes from ya-in-f99.1e100.net (173.194.219.99): icmp_seq=5 ttl=41 time=108 ms
64 bytes from ya-in-f99.1e100.net (173.194.219.99): icmp_seq=6 ttl=41 time=117 ms
^C
--- www.google.com ping statistics ---
6 packets transmitted, 6 received, 0% packet loss, time 5007ms
rtt min/avg/max/mdev = 108.199/110.303/117.093/3.073 ms
bash-4.3#

Thanks..