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root@orangepione:~# ping -c 1 8.8.8.8 ; sysctl -w net.ipv4.ip_default_ttl=65; ping -c 1 8.8.8.8
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=3.35 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 3.353/3.353/3.353/0.000 ms
net.ipv4.ip_default_ttl = 65
PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=119 time=3.00 ms
--- 8.8.8.8 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 2.998/2.998/2.998/0.000 ms
root@orangepione:~#
root@orangepione:~# tcpdump -n -i wlx200db04e7903 -vv host 8.8.8.8 and icmp
tcpdump: listening on wlx200db04e7903, link-type EN10MB (Ethernet), capture size 262144 bytes
22:05:53.497762 IP (tos 0x0, ttl 64, id 44338, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.2.32 > 8.8.8.8: ICMP echo request, id 3, seq 1, length 64
22:05:53.500932 IP (tos 0x60, ttl 119, id 0, offset 0, flags [none], proto ICMP (1), length 84)
8.8.8.8 > 192.168.2.32: ICMP echo reply, id 3, seq 1, length 64
22:05:53.515768 IP (tos 0x0, ttl 65, id 44341, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.2.32 > 8.8.8.8: ICMP echo request, id 4, seq 1, length 64
22:05:53.518682 IP (tos 0x60, ttl 119, id 0, offset 0, flags [none], proto ICMP (1), length 84)
8.8.8.8 > 192.168.2.32: ICMP echo reply, id 4, seq 1, length 64
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