Thanks. 1 - I will send it dirr=ectly to you - not to the list.
2 - No - that is not the problem since it works when I connect via a hotspot (i.e. a different ISP). When I use my "regular" 019 connection, I get: sudo python tmp1.py www.google.com 1 10.0.0.138 0.047 2 10.64.0.250 0.038 3 10.64.0.81 0.04 4 Timed Out 5 213.137.64.169 0.03 6 212.199.247.29 0.036 7 142.250.169.119 0.04 8 142.250.169.118 0.034 9 216.239.50.169 0.036 10 72.14.236.1 0.034 11 Timed Out 12 Timed Out 13 Timed Out 14 Timed Out 15 Timed Out 16 Timed Out 17 Timed Out 18 Timed Out 19 Timed Out 20 Timed Out When I connect via Hotspot (Golan), I get: sudo python tmp1.py www.google.com 1 192.168.43.85 0.054 2 Timed Out 3 172.25.86.33 0.136 4 172.25.50.130 0.042 5 172.27.27.2 0.062 6 172.27.27.6 0.058 7 207.232.57.110 0.062 8 207.232.57.183 0.06 9 72.14.197.132 0.038 10 142.251.229.3 0.086 11 72.14.236.1 0.058 trace complete 12 172.217.22.100 0.056 As you can see 72.14.236.1 is the last hop before reaching the destination, but on 019 all hops after that time out On Sun, 19 May 2024 17:49:32 +0300 אורי <[email protected]> wrote: > Hi Shlomo, > > 1. Send me the code and I will try to test it. > 2. Are you sure there is a reply when your message reaches the > destination? And does it depend on the destination? Some destinations > may disable it for security reasons (DDOS attacks). > > Uri. > אורי > [email protected] > > > On Sun, May 19, 2024 at 5:43 PM Shlomo Solomon > <[email protected]> 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 -- [email protected] > > To unsubscribe send an email to [email protected] > > -- Shlomo Solomon http://the-solomons.net Claws Mail 4.0.0 - KDE Plasma 5.24.7 - Kubuntu 22.04 _______________________________________________ Linux-il mailing list -- [email protected] To unsubscribe send an email to [email protected]
