Arch Linux

RedScare

Member

Registered: 2009-03-28

Posts: 91

Strange ping problem

I have a shell-script that creates a file in my home directory if I am online and deletes it when I go offline, and to do this it uses ping. The problem that I have run into is that, for some strange reason, on the wireless network in my school although I can access the internet through elinks and firefox, I cannot ping anything. Is this some sort of security feature?

Ari'osika

Member

From: Your computer, okay?

Registered: 2010-06-22

Posts: 175

Re: Strange ping problem

AFAIK, It probably is. At my local college and at various hotspots around there, I have the same issue(s) and at others its the opposite! (I don't why but I can ping but I can't use the internet).

Maybe you'll have better luck asking the IT department at your school?

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ngoonee

Forum Fellow

From: Between Thailand and Singapore

Registered: 2009-03-17

Posts: 7,356

Re: Strange ping problem

You could try using wget instead (on some standard page like ip.tupeux.com) and grepping for the 'found' value. Ping is blocked for security reasons in some corporate/school networks.

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RedScare

Member

Registered: 2009-03-28

Posts: 91

Re: Strange ping problem

Does anyone know how they do this? Are they blocking a special sort of packet? Just purely out of interest:)

fukawi2

Ex-Administratorino

From: .vic.au

Registered: 2007-09-28

Posts: 6,224

Website

Re: Strange ping problem

Does anyone know how they do this? Are they blocking a special sort of packet? Just purely out of interest:)

iptables -p icmp --icmp-type echo-request -j DROP

Or worse:

iptables -p icmp -j DROP

It's a stupid thing to do, usually implemented by people who don't actually know what they're doing.

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