what is the difference between EHOSTUNREACH and EHOSTDOWN ?

[Yong]

Hi,

I'm using vxworks 5.3. What's the differences of the errno
EHOSTUNREACH and EHOSTDOWN when connect() fails to connect the other
host? Thanks

Yong

[Chris Hann]

They say that unreachable means there's no network path to that address
but down means that although they can get to the area there's no
response from the destination. At least that's my understanding.

Try google. Aha, a simple google search for

ehostunreach ehostdown "host is"

yields...

http://docsrv.sco.com:507/en/netguide/disockD.error_codes.html

Error Name Description Explanation
EHOSTDOWN Host is down Socket connection. Status information received
by the client host from the underlying communication services indicates
the net or the remote host is down.
EHOSTUNREACH No route to host Socket connection. These operational
errors can occur either because the network or host is unknown (no route
to the host or network is present) or because status information to that
effect has been delivered to the client host by the underlying
communication services.

Yong wrote:

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