최종 돌파구-> 참조샤크아래 결과는 몇 가지 단서를 제공합니다.
안녕하세요. 집에 다음과 같은 설정이 있습니다.
인터넷 - NAS(Ubuntu 16.04.4 LTS) - LAN(ASUS N56U WiFi) - 개인 사용자. NAS 연결 사용량PPPOE(ppp0, 케이블)을 인터넷에 연결하고 eth0(192.168.0.1, 케이블)은 LAN에 연결합니다. ASUS N56U는 고정 IP 192.168.0.2/255.255.255.0 및 DNS 192.168.0.1을 사용하여 NAS에 연결합니다.
모든 것이 잘 작동합니다.
NAS와 가정 사용자는 인터넷에 액세스하고 인터넷은 NAS에 액세스합니다.
나는 유지하면서 방금 Asus N56U로 교체한 또 다른 매우 유사한 라우터(Asus RT-AC66U)를 가지고 있습니다.동일하게 간단한 설정작동하지 않습니다 :(. 제 말은 어떤 뜻인가요?만지다내 개인 웹사이트는 여전히 LAN을 통해 액세스할 수 있지만 인터넷이 다운되었습니다.
NAS(108.177.119.94는 www.google.ro)에서 이 명령을 시도했습니다.
sudo tcpdump -AX -vnni eth0 -c 2 dst 108.177.119.94
라우터에서 실행할 때(텔넷을 통해 액세스할 수 있습니다):
ping -c 2 108.177.119.94
N56U용으로 이것을 얻었습니다:
09:00:47.036839 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.0.2 > 108.177.119.94: ICMP echo request, id 63814, seq 0, length 64
0x0000: 4500 0054 0000 4000 4001 95ef c0a8 0002 E..T..@.@.......
0x0010: 6cb1 775e 0800 d64a f946 0000 7cd9 ab94 l.w^...J.F..|...
0x0020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0030: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0040: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0050: 0000 0000 ....
09:00:48.044176 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.0.2 > 108.177.119.94: ICMP echo request, id 63814, seq 1, length 64
0x0000: 4500 0054 0000 4000 4001 95ef c0a8 0002 E..T..@.@.......
0x0010: 6cb1 775e 0800 95eb f946 0001 ad37 bb94 l.w^.....F...7..
0x0020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0030: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0040: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0050: 0000 0000 ....
AC66U(문제의 것)의 경우:
09:07:16.655875 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.0.2 > 108.177.119.94: ICMP echo request, id 27906, seq 0, length 64
0x0000: 4500 0054 0000 4000 4001 95ef c0a8 0002 E..T..@.@.......
0x0010: 6cb1 775e 0800 638c 6d02 0000 de6b 4905 l.w^..c.m....kI.
0x0020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0030: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0040: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0050: 0000 0000 ....
09:07:17.668123 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto ICMP (1), length 84)
192.168.0.2 > 108.177.119.94: ICMP echo request, id 27906, seq 1, length 64
0x0000: 4500 0054 0000 4000 4001 95ef c0a8 0002 E..T..@.@.......
0x0010: 6cb1 775e 0800 7e18 6d02 0001 b4de 5805 l.w^..~.m.....X.
0x0020: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0030: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0040: 0000 0000 0000 0000 0000 0000 0000 0000 ................
0x0050: 0000 0000 ....
N56U를 사용하면 얻을 수 있습니다(사용TCP 덤프) 요청은 eth0에서 ppp0을 통해 인터넷으로 전송되고 AC66U의 경우에는 위의 결과가 표시됩니다(요청은 eth0에서 수신되고 그 다음에는 아무것도 수신되지 않음).
무엇이 문제일까요?
편집 4 (아래에 가능한 문제를 지적합니다)
위 결과(*.pcap 파일로 저장됨)를 보는 또 다른 방법은 다음과 같습니다.샤크(프레임 1에만 해당)
N56U의 경우 다음을 얻습니다.
$tshark -r n56u-eth0-dst.pcap -V
Frame 1: 98 bytes on wire (784 bits), 98 bytes captured (784 bits)
Encapsulation type: Ethernet (1)
Arrival Time: May 5, 2018 09:00:47.036839000 EEST
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1525500047.036839000 seconds
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 98 bytes (784 bits)
Capture Length: 98 bytes (784 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:icmp:data]
Ethernet II, Src: Motorola_1b:ed:f2 (98:0c:a5:1b:ed:f2), Dst: AsrockIn_7c:28:bf (d0:50:99:7c:28:bf)
Destination: AsrockIn_7c:28:bf (d0:50:99:7c:28:bf)
Address: AsrockIn_7c:28:bf (d0:50:99:7c:28:bf)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Source: Motorola_1b:ed:f2 (98:0c:a5:1b:ed:f2)
Address: Motorola_1b:ed:f2 (98:0c:a5:1b:ed:f2)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.0.2, Dst: 108.177.119.94
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
Total Length: 84
Identification: 0x0000 (0)
Flags: 0x02 (Don't Fragment)
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: ICMP (1)
Header checksum: 0x95ef [validation disabled]
[Header checksum status: Unverified]
Source: 192.168.0.2
Destination: 108.177.119.94
[Source GeoIP: Unknown]
[Destination GeoIP: United States, AS15169 Google Inc., Mountain View, CA, 37.419201, -122.057404]
[Destination GeoIP Country: United States]
[Destination GeoIP AS Number: AS15169 Google Inc.]
[Destination GeoIP City: Mountain View, CA]
[Destination GeoIP Latitude: 37.419201]
[Destination GeoIP Longitude: -122.057404]
Internet Control Message Protocol
Type: 8 (Echo (ping) request)
Code: 0
Checksum: 0xd64a [correct]
[Checksum Status: Good]
Identifier (BE): 63814 (0xf946)
Identifier (LE): 18169 (0x46f9)
Sequence number (BE): 0 (0x0000)
Sequence number (LE): 0 (0x0000)
Data (56 bytes)
0000 7c d9 ab 94 00 00 00 00 00 00 00 00 00 00 00 00 |...............
0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0030 00 00 00 00 00 00 00 00 ........
Data: 7cd9ab940000000000000000000000000000000000000000...
[Length: 56]
AC66U의 경우 다음을 얻습니다.
$tshark -r ac66u-eth0-dst.pcap -V
Frame 1: 98 bytes on wire (784 bits), 98 bytes captured (784 bits)
Encapsulation type: Ethernet (1)
Arrival Time: May 5, 2018 09:07:16.655875000 EEST
[Time shift for this packet: 0.000000000 seconds]
Epoch Time: 1525500436.655875000 seconds
[Time delta from previous captured frame: 0.000000000 seconds]
[Time delta from previous displayed frame: 0.000000000 seconds]
[Time since reference or first frame: 0.000000000 seconds]
Frame Number: 1
Frame Length: 98 bytes (784 bits)
Capture Length: 98 bytes (784 bits)
[Frame is marked: False]
[Frame is ignored: False]
[Protocols in frame: eth:ethertype:ip:icmp:data]
Ethernet II, Src: AsustekC_cb:20:d0 (2c:56:dc:cb:20:d0), Dst: Broadcast (ff:ff:ff:ff:ff:ff)
Destination: Broadcast (ff:ff:ff:ff:ff:ff)
Address: Broadcast (ff:ff:ff:ff:ff:ff)
.... ..1. .... .... .... .... = LG bit: Locally administered address (this is NOT the factory default)
.... ...1 .... .... .... .... = IG bit: Group address (multicast/broadcast)
Source: AsustekC_cb:20:d0 (2c:56:dc:cb:20:d0)
Address: AsustekC_cb:20:d0 (2c:56:dc:cb:20:d0)
.... ..0. .... .... .... .... = LG bit: Globally unique address (factory default)
.... ...0 .... .... .... .... = IG bit: Individual address (unicast)
Type: IPv4 (0x0800)
Internet Protocol Version 4, Src: 192.168.0.2, Dst: 108.177.119.94
0100 .... = Version: 4
.... 0101 = Header Length: 20 bytes (5)
Differentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT)
0000 00.. = Differentiated Services Codepoint: Default (0)
.... ..00 = Explicit Congestion Notification: Not ECN-Capable Transport (0)
Total Length: 84
Identification: 0x0000 (0)
Flags: 0x02 (Don't Fragment)
0... .... = Reserved bit: Not set
.1.. .... = Don't fragment: Set
..0. .... = More fragments: Not set
Fragment offset: 0
Time to live: 64
Protocol: ICMP (1)
Header checksum: 0x95ef [validation disabled]
[Header checksum status: Unverified]
Source: 192.168.0.2
Destination: 108.177.119.94
[Source GeoIP: Unknown]
[Destination GeoIP: United States, AS15169 Google Inc., Mountain View, CA, 37.419201, -122.057404]
[Destination GeoIP Country: United States]
[Destination GeoIP AS Number: AS15169 Google Inc.]
[Destination GeoIP City: Mountain View, CA]
[Destination GeoIP Latitude: 37.419201]
[Destination GeoIP Longitude: -122.057404]
Internet Control Message Protocol
Type: 8 (Echo (ping) request)
Code: 0
Checksum: 0x638c [correct]
[Checksum Status: Good]
Identifier (BE): 27906 (0x6d02)
Identifier (LE): 621 (0x026d)
Sequence number (BE): 0 (0x0000)
Sequence number (LE): 0 (0x0000)
Data (56 bytes)
0000 de 6b 49 05 00 00 00 00 00 00 00 00 00 00 00 00 .kI.............
0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
0030 00 00 00 00 00 00 00 00 ........
Data: de6b49050000000000000000000000000000000000000000...
[Length: 56]
제 생각에는 이 부분이 아닐까 싶습니다(AC66U의 경우).
Destination: Broadcast (ff:ff:ff:ff:ff:ff)
뭔가 잘못되었다는 뜻일까요? 어떤 단서가 있나요?