On 27 Sep, Bob Chiodini wrote:
> Tom Reinertson wrote:
>
>> > Do you happen to be running IP Masquerading? The port numbers look like they are
>> > coming from a masqueraded machine.
>>
>> Yes. I have a Windows machine using the port, however, at the time of the tcpdump I
>> had nothing active on the Windows machine -- no ftp, no IE, nada. In fact, at the
>> same time, I had another tcpdump on the eth0 connection to be sure no packets were
>> coming across from the Windows macine. It was absolutely quiet.
>>
>> > Another possibility, although very unlikely,
>> > is that your ISP has its terminal server setup in such a way that it is on a
>> > shared media segment. You might then see traffic from others that are logged
>> > in. What is the subnet mask on your ppp0 interface when you are logged in? It
>> > probably should be something like 255.255.255.252. I just checked mine and it
>> > was 255.255.255.255 when diald initiated the connection and 255.255.255.252 when
>> > I used the script I wrote when I first signed up with my ISP. I added the
>> > "netmask 255.255.255.252" option to my diald.conf file.
>>
>> Maybe I don't understand your question, but I thought all ppp connections had a
>> netmask of 255.255.255.255. I checked with ifconfig and verified that. How could
>> it be otherwise? Your idea of a shared media segment is intriguing because, as I
>
>> said in the first post, it looks as if I was watching traffic from some other
>
>> machine whizzing past to the ISP. But since I'm on a ppp connection I don't know
>> how that would be possible.
>
> It depends on what kind of hardware USWest is using to support dialup.
>
> The reason I asked about your subnet mask was to determine how many possible hosts
>could
> appear on your subnet with your ISP.
>
> It looks like diald defaults to a netmask of 255.255.255.255, I don't know if this
> applies to any Class for the local address or not, I use a Class A, 10.0.0.1. The
> netmask carries over from the tap0 interface to the ppp0 interface after the
>connection
> is made. Try adding the "netmask 255.255.255.252" and you should see
>255.255.255.252 on
> your tap0 interface before diald dials and then on the ppp0 interface after diald
> completes the call.
>
> When I initially setup Linux and pppd to my ISP, they (my ISP) told me that the
>netmask
> would be 255.255.255.252. This mask allows a subnet with two hosts, you and your
>ISP.
> I really do not understand a subnet mask of 255.255.255.255, this would imply zero
>hosts
> (invalid?). Maybe someone else could enlighten me.
(end cutted...)
I never heard about this mask and i think it's incorect, of course
255.255.255.0 is better in that case (i mean with no need for subneting)
Niko
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