The intranet of the company cannot access an Internet website

After investigation:

1. Troubleshoot server-side problems

Using tcping test, it is found that the website is open to tcp port and can be accessed through other networks, which proves that there is basically no problem on the server side.

2. Troubleshoot mtu problems

Ping-f-l specifies no fragmentation, message size, and the best MTU value for testing is 1464.

C:\ Users\ Administrator > ping-f-l 1465 www.baidu.com

Ping www.a.shifen.com [115.239.210.27] has 1465 bytes of data:

Reply from 101.86.123.76: need to split the packet but set DF.

The packet needs to be split but DF is set.

The packet needs to be split but DF is set.

The packet needs to be split but DF is set.

115.239.210.27 Ping statistics:

Packet: sent = 4, received = 1, lost = 3 (75% lost)

C:\ Users\ Administrator > ping-f-l 1464 www.baidu.com

Ping www.a.shifen.com [115.239.210.27] has 1464 bytes of data:

Reply from 115.239.210.27: bytes = 1464 time = 8ms TTL=51

Reply from 115.239.210.27: bytes = 1464 time = 10ms TTL=51

Reply from 115.239.210.27: bytes = 1464 time = 10ms TTL=51

Reply from 115.239.210.27: bytes = 1464 time = 9ms TTL=51

115.239.210.27 Ping statistics:

Packet: sent = 4, received = 4, lost = 0 (0% lost)

Estimated time for round trip (in milliseconds):

Shortest = 8ms, longest = 10ms, average = 9ms

C:\ Users\ Administrator >

3. Modify the egress router interface mtu

Solve the problem of modifying egress router interface mtu less than or equal to 1464