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From: Roedy Green on 23 Mar 2010 08:24
InetAddress.isReachable always returns false. I am puzzled why.

My router is set to pass UDP port 7 through. I can ping google.ca.
--
Roedy Green Canadian Mind Products
http://mindprod.com

Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, �How would I develop if it were my money?� I�m amazed how many theoretical arguments evaporate when faced with this question.
~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming.
From: rossum on 23 Mar 2010 09:26
On Tue, 23 Mar 2010 05:24:19 -0700, Roedy Green
<see_website(a)mindprod.com.invalid> wrote:

>InetAddress.isReachable always returns false. I am puzzled why.
>
>My router is set to pass UDP port 7 through. I can ping google.ca.
What timeout are you using? Too short a timeout may cause a false
return if the host takes too long to reach.

Similarly the ttl parameter may need to be set to more than the
default zero.

rossum

From: Roedy Green on 23 Mar 2010 10:03
On Tue, 23 Mar 2010 13:26:22 +0000, rossum <rossum48(a)coldmail.com>
wrote, quoted or indirectly quoted someone who said :

>What timeout are you using? Too short a timeout may cause a false
>return if the host takes too long to reach.

I was using 10 seconds. I'll try bumping up the TTL.
--
Roedy Green Canadian Mind Products
http://mindprod.com

Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, �How would I develop if it were my money?� I�m amazed how many theoretical arguments evaporate when faced with this question.
~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming.
From: Arne Vajhøj on 23 Mar 2010 20:20
On 23-03-2010 08:24, Roedy Green wrote:
> InetAddress.isReachable always returns false. I am puzzled why.
>
> My router is set to pass UDP port 7 through. I can ping google.ca.

Most *nix implementation use ICMP (ping).

The windows version is said to use TCP to port 7 (echo).

Arne
From: Roedy Green on 23 Mar 2010 20:55
On Tue, 23 Mar 2010 07:03:30 -0700, Roedy Green
<see_website(a)mindprod.com.invalid> wrote, quoted or indirectly quoted
someone who said :

>
>I was using 10 seconds. I'll try bumping up the TTL.

no joy.
--
Roedy Green Canadian Mind Products
http://mindprod.com

Responsible Development is the style of development I aspire to now. It can be summarized by answering the question, �How would I develop if it were my money?� I�m amazed how many theoretical arguments evaporate when faced with this question.
~ Kent Beck (born: 1961 age: 49) , evangelist for extreme programming.
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