Jag testade med SSH (TCP) till mitt eget server tillsammas med ping till samma IP adress (ingen DNS). SSH körde bara bra, men ping (ICMP) var on/off. Det säger till mig där ComHem har problem att öppna nya connection, men kan hålla pågående connectioner bara bra. Kanske dem får problemer med CGNAT eller IPv4 tilldelning?
17:21:46.590515 IP 192.168.0.8.52374 > <myServer>.22: Flags [.], ack 62986, win 2038, options [nop,nop,TS val 534856385 ecr 1816929257], length 0
17:21:46.791504 IP 192.168.0.8 > <myServer>: ICMP echo request, id 46425, seq 21, length 64
17:21:46.846744 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:46.846754 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:46.846779 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:46.846800 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:47.477331 IP <myServer>.22 > 192.168.0.8.52374: Flags [P.], seq 62986:63574, ack 4766, win 501, options [nop,nop,TS val 1816930260 ecr 534856385], length 588
17:21:47.512116 IP 192.168.0.8.52374 > <myServer>.22: Flags [.], ack 63574, win 2038, options [nop,nop,TS val 534857303 ecr 1816930260], length 0
17:21:47.797623 IP 192.168.0.8 > <myServer>: ICMP echo request, id 46425, seq 22, length 64
17:21:48.476168 IP <myServer>.22 > 192.168.0.8.52374: Flags [P.], seq 63574:64162, ack 4766, win 501, options [nop,nop,TS val 1816931259 ecr 534857303], length 588
17:21:48.478554 IP 192.168.0.8.52374 > <myServer>.22: Flags [.], ack 64162, win 2038, options [nop,nop,TS val 534858268 ecr 1816931259], length 0
17:21:48.801049 IP 192.168.0.8 > <myServer>: ICMP echo request, id 46425, seq 23, length 64
17:21:49.476062 IP <myServer>.22 > 192.168.0.8.52374: Flags [P.], seq 64162:64750, ack 4766, win 501, options [nop,nop,TS val 1816932258 ecr 534858268], length 588
17:21:49.662643 IP 192.168.0.8.52374 > <myServer>.22: Flags [.], ack 64750, win 2038, options [nop,nop,TS val 534859448 ecr 1816932258], length 0
17:21:49.801261 IP 192.168.0.8 > <myServer>: ICMP echo request, id 46425, seq 24, length 64
17:21:50.480119 IP <myServer>.22 > 192.168.0.8.52374: Flags [P.], seq 64750:65338, ack 4766, win 501, options [nop,nop,TS val 1816933263 ecr 534859448], length 588
17:21:50.584310 IP 192.168.0.8.52374 > <myServer>.22: Flags [.], ack 65338, win 2038, options [nop,nop,TS val 534860365 ecr 1816933263], length 0
17:21:50.806499 IP 192.168.0.8 > <myServer>: ICMP echo request, id 46425, seq 25, length 64
17:21:50.878766 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:50.878793 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:50.878825 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92
17:21:50.878831 IP <myExternalIp> > 192.168.0.8: ICMP host <myServer> unreachable, length 92