UDP lost?

[Kenneth Burgener]

I am trying to test UDP traffic between two points.  I am using ngrep
and nemesis.  On the receiving machine I run:

[root at asterisk1 ~]# ngrep -d any -W byline -t port 4444

And on the sending machine I run:

nemesis udp -v -S <10.10.10.17> -D <X.X.X.X> -x 11111 -y 4444 -P hello.txt

Where X.X.X.X is the destination machine's IP address.  The problem is
this.  When the destination machine is on the local network I see the
packets show up in the ngrep's output, but if the destination machine is
not on my local network I never see the traffic show up.  My first
thought was maybe my ISP is blocking UDP traffic, except for I then
remember that I play several online games that use UDP, and I also
successfully connect my SIP phone to this external server and I can see
the that traffic in ngrep's output.

Any idea why my generated UDP traffic is getting lost to the external
machine?

Thanks,
Kenneth