![]() ![]() ICMP traffic to the internet is fine, too.It looks exactly the same as visible in the screens (packet 309, 310, 320. I filtered on packets having the SYN flag set, as these packets are relevant only.Īs mentioned above, I also took a traffic capture from the server side. ![]() Traffic from packet 309 onwards is from the broken host. The capture contains traffic from the working host up until package 308. IP identification header and therefore IP header checksumįollowing a screenshot capturing traffic at the DSL modem port.They look the same to me, differing only in On both machines I executed curl -4 and curl -4 and compared the TCP SYN packets. ![]() Traffic from another debian machine in the network using the same topology looks fine. I captured some traffic using port mirroring of the DSL modem switch port ensuring I really see traffic passing the line to the internet. I tried to reach different hosts, also a server where I am able to capture traffic. The host isn't able to establish a tcp connection to any host in the internet. Christian Rudolph Asks: TCP communication to internet broken - no SYN-ACK receivedĭebian bullseye host (Proxmox VE) -> OPNsense firewall doing NAT -> DSL modem (connected via PPPoE) -> Internet
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