Guten Morgen,
ich habe auf meinen zwei vServern derzeit das Problem, dass ich auf eine einzelne Ping-Anfrage eine doppelte Antwort erhalte. Dies passiert auch dann, wenn ich von einem Rescue-System boote. Hat hier jemand das gleiche Problem oder einen Lösungsansatz?
Nachfolgend die Ping-Befehle und die entsprechenden tcpdumps:
Code
┌─[ thomas@makalu ]─(2016-04-21 13:59)─￫ ~
├─( ⚡ )
└─[$] ping 2a03:4000:6:d086::2 -c1
PING 2a03:4000:6:d086::2(2a03:4000:6:d086::2) 56 data bytes
64 bytes from 2a03:4000:6:d086::2: icmp_seq=1 ttl=63 time=0.750 ms
--- 2a03:4000:6:d086::2 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 0.750/0.750/0.750/0.000 ms
┌─[ thomas@makalu ]─(2016-04-22 00:07)─￫ ~
├─( ⚡ )
└─[$] sudo tcpdump dst host 2a03:4000:6:d086::2 or src host 2a03:4000:6:d086::2 -vv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
00:33:13.637732 IP6 (hlim 64, next-header ICMPv6 (58) payload length: 64) xxxx > 2a03:4000:6:d086::2: [icmp6 sum ok] ICMP6, echo request, seq 1
00:33:13.638357 IP6 (hlim 63, next-header ICMPv6 (58) payload length: 64) 2a03:4000:6:d086::2 > xxxx: [icmp6 sum ok] ICMP6, echo reply, seq 1
00:33:13.638393 IP6 (hlim 63, next-header ICMPv6 (58) payload length: 64) 2a03:4000:6:d086::2 > xxxx: [icmp6 sum ok] ICMP6, echo reply, seq 1
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernelCode
┌─[ thomas@makalu ]─(2016-04-22 00:33)─￫ ~
├─( ⚡ )
└─[$] ping -c1 2a00:1450:4001:80f::2003
PING 2a00:1450:4001:80f::2003(2a00:1450:4001:80f::2003) 56 data bytes
64 bytes from 2a00:1450:4001:80f::2003: icmp_seq=1 ttl=60 time=4.84 ms
--- 2a00:1450:4001:80f::2003 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 4.843/4.843/4.843/0.000 ms
┌─[ thomas@makalu ]─(2016-04-22 00:33)─￫ ~
├─( ⚡ )
└─[$] sudo tcpdump dst host 2a00:1450:4001:80f::2003 or src host 2a00:1450:4001:80f::2003 -vv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
00:34:02.973720 IP6 (hlim 64, next-header ICMPv6 (58) payload length: 64) xxxx > fra07s64-in-x03.1e100.net: [icmp6 sum ok] ICMP6, echo request, seq 1
00:34:02.978471 IP6 (hlim 60, next-header ICMPv6 (58) payload length: 64) fra07s64-in-x03.1e100.net > xxxx: [icmp6 sum ok] ICMP6, echo reply, seq 1
00:34:02.978521 IP6 (hlim 60, next-header ICMPv6 (58) payload length: 64) fra07s64-in-x03.1e100.net > xxxx: [icmp6 sum ok] ICMP6, echo reply, seq 1
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernelUnd aus der System Rescue CD heraus:
Code
root@sysresccd /root % ping6 2a00:1450:4001:814::2003 -c1
PING 2a00:1450:4001:814::2003(2a00:1450:4001:814::2003) 56 data bytes
64 bytes from 2a00:1450:4001:814::2003: icmp_seq=1 ttl=59 time=4.38 ms
--- 2a00:1450:4001:814::2003 ping statistics ---
1 packets transmitted, 1 received, 0% packet loss, time 0ms
rtt min/avg/max/mdev = 4.382/4.382/4.382/0.000 ms
root@sysresccd /root % tcpdump dst host 2a00:1450:4001:814::2003 or src host 2a00:1450:4001:814::2003 -vv
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
07:46:41.168091 IP6 (hlim 64, next-header ICMPv6 (58) payload length: 64) 2a03:4000:6:1067::1 > 2a00:1450:4001:814::2003: [icmp6 sum ok] ICMP6, echo request, seq 1
07:46:41.172449 IP6 (hlim 59, next-header ICMPv6 (58) payload length: 64) 2a00:1450:4001:814::2003 > 2a03:4000:6:1067::1: [icmp6 sum ok] ICMP6, echo reply, seq 1
07:46:41.172467 IP6 (hlim 59, next-header ICMPv6 (58) payload length: 64) 2a00:1450:4001:814::2003 > 2a03:4000:6:1067::1: [icmp6 sum ok] ICMP6, echo reply, seq 1
^C
3 packets captured
3 packets received by filter
0 packets dropped by kernel
