The subnet broadcast for Ethernet is 10.194.9.255 while for the wireless computer-to-computer is 169.254.255.255.
When both interfaces are on with Ethernet set as first in the network order, I can successfully ping Host2 connected to en1
with an IP of 169.254.73.226, but I was not able to successfully ping 169.254.255.255.
But when I connected en1 to a router with a broadcast address of 157.184.80.255, I was able to ping the subnet broadcast
even if both en0 and en1 are enabled.
From: Peter
Sichel <email@hidden>
To: "email@hidden Programming" <email@hidden>
Sent: Tuesday, April 28, 2009 10:12:31 PM
Subject: Re: Created Computer-to-Computer Network ping error when Ethernet is enabled?
On Apr 28, 2009, at 9:41 AM, Ian Mark Salvame wrote:
> Host1 is Ethernet connected and I created a computer-to-computer network wirelessly.
> I connected Host2 to Host1 through the created computer-to-computer network.
Host1 is now "multihomed" or attached to two networks: (1) Ethernet; (2) computer-to-computer wireless.
Within the Network Preferences Panel, there is a "Network Service Order" which defines which network connection (wired or wireless) will be is used first when it is available.
> I can successfully ping Host2 from Host1.
> But when I tried pinging the broadcast address of en1(i.e. 169.254.255.255) from Host1
> I was not able to get a reply, it keeps on saying "host is down".
Broadcasts are not automatically forwarded from network to another, and 169.254.255.255 is not a universal broadcast address, but a subnet broadcast address that depends on other stations being configured to
use the same IP subnet. The "host is down" message generally means there was no response to ARP for the specified destination address.
> However, if I disable Ethernet connection, I can successfully ping the broadcast address of en1.
> I am using Leopard 10.5.6.
You haven't specified what IP subnet your Ethernet and AirPort interfaces have been configured to use. Are they on the same IP subnet?
> Is the above scenario normal?
It depends on what you did. The behavior of some configurations is not well defined.
- Peter
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