Ping doesn't work, browsing does

I have a problem with pinging. I have iptables setup to masquerade and
the input allows connectiongs that are related and established on eth0,
but when I ping www.google.com it comes back "Request timed out." But I
can acces www.google.com. Is there something that I need to add to my
iptables ruleset? I can ping my linuxbox from any computer on eth1. I am
on a university network. I can ping anything that has arizona.edu in the
domain name, nothing else. Thanks in advance.

> I have a problem with pinging. I have iptables setup to masquerade and
> the input allows connectiongs that are related and established on eth0,
> but when I ping www.google.com it comes back "Request timed out." But I
> can acces www.google.com. Is there something that I need to add to my
> iptables ruleset? I can ping my linuxbox from any computer on eth1. I am
> on a university network. I can ping anything that has arizona.edu in the
> domain name, nothing else. Thanks in advance.

Your university is probably blocking incoming ICMP traffic at its firewall.
(ICMP is the protocol that ping uses to check the presence of machines.)
Your outgoing ICMP messages are probably getting out of your firewall, but
the replies to your machine are blocked.

RF

Rich Fearn wrote:

> Your university is probably blocking incoming ICMP traffic at its firewall.
> (ICMP is the protocol that ping uses to check the presence of machines.)
> Your outgoing ICMP messages are probably getting out of your firewall, but
> the replies to your machine are blocked.
>
> RF
>
>
That makes sense, well thank you for your quick reply.

"Chris" <(E-Mail Removed)> wrote in message
news:bkqf75$1bd$(E-Mail Removed)...
> I have a problem with pinging. I have iptables setup to masquerade and
> the input allows connectiongs that are related and established on eth0,
> but when I ping www.google.com it comes back "Request timed out." But I
> can acces www.google.com. Is there something that I need to add to my
> iptables ruleset? I can ping my linuxbox from any computer on eth1. I am
> on a university network. I can ping anything that has arizona.edu in the
> domain name, nothing else. Thanks in advance.
>


No, I used to try to ping google.com to test because it was the first thing
that came to mind, but quickly figured out www.google.com block pings on
thier end. Probably because of getting ICMP ddos'd out the ying yang.

Eric

On Thu, 25 Sep 2003 16:43:45 -0400, Eric Gibson wrote:
>
> No, I used to try to ping google.com to test because it was the first thing
> that came to mind, but quickly figured out www.google.com block pings on
> thier end.

Take that calculator in for repair, if figured wrong

ping -c 1 yahoo.com
PING yahoo.com (66.218.71.198) 56(84) bytes of data.
64 bytes from w1.rc.vip.scd.yahoo.com (66.218.71.198):
icmp_seq=1 ttl=240 time=49.8 ms

--- yahoo.com ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 49.849/49.849/49.849/0.000 ms

Bit Twister <(E-Mail Removed)> wrote in
news:(E-Mail Removed):

> On Thu, 25 Sep 2003 16:43:45 -0400, Eric Gibson wrote:
>>
>> No, I used to try to ping google.com to test because it was the first
>> thing that came to mind, but quickly figured out www.google.com block
>> pings on thier end.
>
> Take that calculator in for repair, if figured wrong
>
> ping -c 1 yahoo.com
> PING yahoo.com (66.218.71.198) 56(84) bytes of data.
> 64 bytes from w1.rc.vip.scd.yahoo.com (66.218.71.198):
> icmp_seq=1 ttl=240
> time=49.8 ms

That's yahoo.com, not google.com. But anyway I just tried to ping
google.com and it appears to be working now. I swear it never used to
work! ;-)

I noticed when pinging it that google.com is now resolving as
www.google.akadns.net. They are using Akamai now? I've never seen that,
of course it was like a year ago that I determined this, everything could
have changed.

Eric

>
> --- yahoo.com ping statistics ---
> 1 packets transmitted, 1 received, 0% packet loss, time 0ms
> rtt min/avg/max/mdev = 49.849/49.849/49.849/0.000 ms
>