Thanks. Forgot to mention that I DID try the code at school and it works - high school - not university :-)
I don't want to go to the time and expense of using a cloud server. I want this to work at home as it has worked for many years :-) On Sun, 19 May 2024 17:49:06 +0300 Shay Gover <govers...@gmail.com> wrote: > Maybe use a vm on some random cloud service? > Or better yet, use a university computer. > > On Sun, May 19, 2024 at 5:43 PM Shlomo Solomon > <shlomo.solo...@gmail.com> wrote: > > > I teach computer networking and the latest assignment I gave my > > students was to use Python and Scapy to emmulate traceroute. The > > code is simple: > > - send an ICMP packet with TTL = 1 which will fail but return the > > first hop address > > - continue sending ICMP packets - each time increasing the TTL to > > get the next hop > > - if the ICMP reply is NOT an error, we have arrived. > > > > None of my student submissions worked, which was strange, so I > > tried my own code which I know is correct. > > It also did not work. > > The error messages arrive for each hop, but it seems that the NO > > ERROR message (when the destination is reached) is not arriving. > > I also checked with Wireshark and see error replies (as I should) > > for each hop, but then (when I assume I have reached the > > destination) there is no reply. > > > > I then tried disconnecting my computer from my ISP and connected > > via a Hotspot on my phone - PROBLEM SOLVED. > > > > So this seems to be a problem with my ISP (019) blocking some > > traffic. But I don't know what the next step is. > > If I call customer service, I'm sure no-one will understand what I > > want. > > > > BTW - ping and the "real" traceroute work fine. > > I also looked at router settings, but did not find anything > > suspicious. > > > > Can anyone suggest how to explain my problem to my ISP? > > > > ALSO - if there is anyone using 019, I would be happy to send my > > code for testing to verify that this is really a problem with 019. > > > > > > > > -- > > Shlomo Solomon > > http://the-solomons.net > > Claws Mail 4.0.0 - KDE Plasma 5.24.7 - Kubuntu 22.04 > > _______________________________________________ > > Linux-il mailing list -- linux-il@cs.huji.ac.il > > To unsubscribe send an email to linux-il-le...@cs.huji.ac.il > > -- Shlomo Solomon http://the-solomons.net Claws Mail 4.0.0 - KDE Plasma 5.24.7 - Kubuntu 22.04 _______________________________________________ Linux-il mailing list -- linux-il@cs.huji.ac.il To unsubscribe send an email to linux-il-le...@cs.huji.ac.il
