That is certainly a possibility, but since the packets and the replies are between me and various routers on the way to the destination (and not directed at 019), I don't see the point. As I mentioned, only the final reply (from the destination) does not arrive - error replies from all the router on the way DO arrive.
On Sun, 19 May 2024 18:40:59 +0300 אורי <u...@speedy.net> wrote: > 019 might have disabled it for the same reason (security/DDOS) > אורי > u...@speedy.net > > > On Sun, May 19, 2024 at 6:08 PM Shlomo Solomon > <shlomo.solo...@gmail.com> wrote: > > > 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 <u...@speedy.net> 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 > > > u...@speedy.net > > > > > > > > > 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 > > -- 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
