Question

1

Cannot Ping from server when logged in from another machine

rated 0 times [ 1] [ 0] / answers: 1 / hits: 4508 / 1 Year ago, tue, november 29, 2022, 1:29:45

So I found out my problem when I would use the curl method on my linux Ubunutu 12.10 Server at home while logged in from my laptop (Mac OSX Lion). Nothing was happening when I would use the curl method so I thought I would try to ping a website where I know its up and running and I would get this:

ping: unknown host facebook.com

So Im guessing there is something blocking something here. I tried other sites with no success. Just the same error. I researched elsewhere but I couldn't really find a solution.

I typed this in terminal:

sudo iptables -L

...and I got this response

Chain INPUT (policy ACCEPT)

target     prot opt source               destination         



Chain FORWARD (policy ACCEPT)

target     prot opt source               destination         



Chain OUTPUT (policy ACCEPT)

target     prot opt source               destination

Does that look fine to anybody or should there be more information in there?

Update

I should also add that I am pretty new to hosting my own server and I have a Dynamic IP at the moment and not a static one. I have learned a lot over the past short while but just want to give the heads up that I may not know a whole lot about it.

That being said everyone seems to think its a DNS issue. So I checked the etc/resolv.conf file and there wasn't anything in there except a commented message.

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

Did I forget a step when setting up my server? Also would this fix the curl issues I was having. I was just trying to install RVM by curl according to the tutorial but nothing happened. No message that it failed or succeeded.

Update 2

~~So I did some research and it looks like a known bug with Ubuntu 12.10 upgrade, which I had just did before using these commands.~~

~~DNS resolution fails after 12.10 upgrade~~

I thought the above was causing the problem but it wasn't in my case

Here is what reads inside /etc/network/interfaces

# The loopback network interface

auto lo

iface lo inet loopback



# The primary network interface

auto eth0

iface eth0 inet static

address 192.168.1.131

netmask 255.255.255.0

gateway 192.168.1.1

Thanks,

Joe

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lowovey

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answered 1 Year ago ainlyyor · Accepted Answer

Agreed, this is a DNS resolution error. You can verify this by pinging facebooks actual IP:

# ping 173.252.110.27

# 64 bytes from 173.252.110.27: icmp_seq=0 ttl=239 time=124.665 ms

# 64 bytes from 173.252.110.27: icmp_seq=1 ttl=239 time=83.031 ms

If pinging the IP fails, it's likely a network issue. If it succeeds, it's likely a dns issue.

UPDATE

Based on new information:

I'll assume (and if I'm wrong, I'll need to know a lot more about your setup) that you have a typical broadband internet service provider, and a typical consumer grade router that your other machines connect to just fine. If that is the case, you should comment out the last 5 lines and add this at the end:

auto eth0

iface eth0 inet dhcp

Then perform these commands:

# sudo ifconfig eth0 down ; sudo ifconfig eth0 up ; sudo dhclient

Let me know if anything errors out.