乙太網路上的網際網路:DNS 有效,ping 無效(Windows 有效,Linux 無效)

乙太網路上的網際網路:DNS 有效,ping 無效(Windows 有效,Linux 無效)

我有一台使用乙太網路連接到網路的電腦。使用 Ubuntu,我可以使用 nslookup 解析域,但如果我嘗試執行“ping google.com”或“ping 74.125.39.104”,它不起作用。

我在兩台上網本上使用過 Arch Linux、Mint 和 Ubuntu Live,但都沒有成功。然而,Windows 工作得很好。讓我不再使用 Windows!

如果配置:

sudo ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:26:18:80:79:18  
          inet addr:10.20.6.180  Bcast:10.20.7.255  Mask:255.255.254.0
          inet6 addr: fe80::226:18ff:fe80:7918/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5751 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2397 errors:0 dropped:0 overruns:0 carrier:17
          collisions:0 txqueuelen:1000 
          RX bytes:659976 (659.9 KB)  TX bytes:253881 (253.8 KB)
          Interrupt:40

路線:

route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.20.6.0       0.0.0.0         255.255.254.0   U     1      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
0.0.0.0         10.20.6.1       0.0.0.0         UG    0      0        0 eth0
0.0.0.0         10.20.6.1       0.0.0.0         UG    202    0        0 eth0

網路統計:

netstat -nr
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.20.6.0       0.0.0.0         255.255.254.0   U         0 0          0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U         0 0          0 eth0
0.0.0.0         10.20.6.1       0.0.0.0         UG        0 0          0 eth0
0.0.0.0         10.20.6.1       0.0.0.0         UG        0 0          0 eth0

iptables:

sudo iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

解決.conf:

cat /etc/resolv.conf
# Generated by resolvconf 
search uni-mannheim.de 
nameserver 134.155.96.51 
nameserver 134.155.96.53

追蹤路徑不工作:

sudo tracepath www.google.com
 1:  laptop.local                                          0.342ms pmtu 1500
 1:  no reply
 2:  no reply
 3:  no reply
 4:  no reply

/etc/主機.conf

sudo cat /etc/host.conf
# The "order" line is only used by old versions of the C library.
order hosts,bind
multi on

/etc/nsswitch.conf

sudo cat /etc/nsswitch.conf
# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc-reference' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd:         compat
group:          compat
shadow:         compat

hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4
networks:       files

protocols:      db files
services:       db files
ethers:         db files
rpc:            db files

netgroup:       nis

nslookup google.com

nslookup google.com
Server:     134.155.96.51
Address:    134.155.96.51#53

Non-authoritative answer:
Name:   google.com
Address: 74.125.39.104
Name:   google.com
Address: 74.125.39.105
Name:   google.com
Address: 74.125.39.106
Name:   google.com
Address: 74.125.39.147
Name:   google.com
Address: 74.125.39.99
Name:   google.com
Address: 74.125.39.103

wget google.com

wget google.com
--2011-08-17 11:05:01--  http://google.com/
Resolving google.com... 74.125.39.99, 74.125.39.103, 74.125.39.104, ...
Connecting to google.com|74.125.39.99|:80...

挖掘 google.com

tracepath 不起作用,但 dig 起作用

dig google.com

; <<>> DiG 9.7.3 <<>> google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2643
;; flags: qr rd ra; QUERY: 1, ANSWER: 6, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;google.com.            IN  A

;; ANSWER SECTION:
google.com.     175 IN  A   74.125.39.103
google.com.     175 IN  A   74.125.39.104
google.com.     175 IN  A   74.125.39.105
google.com.     175 IN  A   74.125.39.106
google.com.     175 IN  A   74.125.39.147
google.com.     175 IN  A   74.125.39.99

;; AUTHORITY SECTION:
google.com.     104161  IN  NS  ns4.google.com.
google.com.     104161  IN  NS  ns3.google.com.
google.com.     104161  IN  NS  ns1.google.com.
google.com.     104161  IN  NS  ns2.google.com.

;; ADDITIONAL SECTION:
ns1.google.com.     277325  IN  A   216.239.32.10
ns2.google.com.     277325  IN  A   216.239.34.10
ns3.google.com.     277325  IN  A   216.239.36.10
ns4.google.com.     277325  IN  A   216.239.38.10

;; Query time: 2 msec
;; SERVER: 134.155.96.51#53(134.155.96.51)
;; WHEN: Wed Aug 17 11:06:14 2011
;; MSG SIZE  rcvd: 260

答案1

不要太擔心 ping,伺服器基礎設施阻止 ping 的情況並不罕見。 Ping 和traceroute 通常使用ICMP。更好的測試是使用wget http://www.google.com使用 HTTP 的方法。

首先用於host www.google.com測試 DNS(較舊的 Linux 系統將有nslookupdig取代host

$ 託管 www.google.com
www.google.com 是 www.l.google.com 的別名。
www.l.google.com 網址為 209.85.143.104
www.l.google.com 網址為 209.85.143.99


$ wget http://www.google.com
--12:21:13-- http://www.google.com/
           => `index.html'
正在解析 www.google.com... 已完成。
正在連接 www.google.com[209.85.143.99]:80...已連線。
HTTP 請求已傳送,正在等待回應... 200 OK
長度:未指定 [文本/html]

    [ ] 9,931 167.21K/秒

12:21:14 (167.21 KB/s) - `index.html' 已儲存 [9931]

答案2

你的/etc/resolve.conf是什麼?它應該指向您的路由器

該文件對於連接到互聯網非常重要。

答案3

驗證 Firestarter 防火牆:

chkconfig -l | chkconfig -l | grep 火啟動器

點火器 0:關閉 1:關閉 2:關閉 3:關閉 4:關閉 5:關閉 6:關閉 S:開啟

停用 Firestarter 防火牆:

sudo chkconfig firestarter 關閉

並再次檢查:

chkconfig -l | chkconfig -l | grep 火啟動器

點火器 0:關閉 1:關閉 2:關閉 3:關閉 4:關閉 5:關閉 6:關閉

並停止防火牆:

須藤 firestarter -p

繼續,再嘗試 ping。

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