On 22/04/18 20:53, Gui Iribarren wrote: > today, since i woke up "internet was not working" at stein712 > i just time to take a closer look, and something funny is going on. > global ipv6 works as expected. > ipv4 icmps also work fine, RTT to various known places is legit > but any tcpv4 fails misteriously with a RST > a tcpdump on both ends (laptop inside funkfeuer and a server outside of > austria) shows the syn, syn/ack, ack handshake go without problem, but then > the first data packet server->laptop never reaches the laptop, instead the > server receives a RST around 50ms after (roughly the RTT laptop-server, which > would indicate the RST comes from near the laptop i.e. funkfeuer or austria > at least) > > this misterious RST is *not* coming from my laptop. > > the first data packet laptop-server *does* reach the server. server replies > with a RST, since it already dropped the connection. > > just in case, i reproduced the same behaviour using starting point my openwrt > node (so, one hop upstream from my laptop) which is as far as i have admin > access. previous paragraphs apply s/laptop/ubiquiti/g >
attached relevant packets from simultaneous tcpdumps running on openwrt node, and on server, while trying a simple "ssh 109.69.8.34" from openwrt > any ideas? > > -- > Wien mailing list > [email protected] > https://lists.funkfeuer.at/mailman/listinfo/wien >
weird_rst_0xff_side.pcapng
Description: application/pcapng
weird_rst_server_side.pcapng
Description: application/pcapng
-- Wien mailing list [email protected] https://lists.funkfeuer.at/mailman/listinfo/wien
