Apple: IP update stopped on iPad/iPhone OS 3.2

Stop IP update on iPad/iPhone OS 3.2

 

This problem was recently discovered by technicians at Princeton University in New Jersey. At present, it seems that only they have reported this problem. Is it a college network problem or an os3.2 problem? Not long ago, some end users had doubts about Apple's quality assurance system.

 

This problem was discovered shortly after the iPad was recently shipped, and the network staff published this message on their college website on February 1, April 20. They found that the IP address is always used when the iPad device obtains the DHCP address, even if the lease time of the address has expired, the IP address is still used.

 

The malfunction we see is that the iPad uses DHCP to obtain a lease, renews the lease zero or more times (as expected), but then continues using the IP address without renewing the lease further. the iPad allows the DHCP lease to expire, but it continues using the IP address after allowing the lease to expire. the incident continues for some time (typically hours); usually it ends when the iPad asks for a new DHCP lease, or the iPad disconnects from the network.

 

This problem is not a big problem for a general network, and even users may not be aware of it during use. However, the situation for Princeton University is different because of this problem, many iPad devices have been automatically disabled, that is, users cannot use the on-campus network. This is because their networks strictly manage devices that use IP addresses illegally, the expired IP addresses of these iPad are not updated, so they are automatically disabled by the network. Therefore, end users and network personnel will respond strongly to this problem.

 

During the reproduction process they described, it seems that this problem only occurs when the IP address is rented after the screen lock of the iPad expires.
After the iPad, the iPad does not check the updated IP address.

 

At present, it seems that only they have reported this problem. Is it their network configuration problem? It seems that only some iPad have this problem, not all, so it may not be an iPad problem. According to the university's network staff, it should not be a problem with their network, because their network only handles iPad with problems generated within one day, and they can repeat the problem-if they are interested, they can repeat the "Steps to reproduce" reproduction process they described.

 

At the same time, students from the school complained that the school's network management is too strict. For example, if any iPhone is installed with remote control software, it will be immediately banned. This makes the students with a strong desire to learn crazy. This also allows users to have further questions about the current school's network rules, and this question and may bring about a change, apparently the school is unwilling to face.

 

Many users complain about the quality of Apple products on the Internet. In addition, the Wi-Fi feature of iPad may cause apple to recall the old saying that, some people have begun to doubt whether Apple's quality control system QA is effective.

 

Further discussions are still ongoing. This issue seems to be not limited to the technical level, but has a tendency to develop towards network management rules. As you can imagine, the competition between network users and network management continues.

 

Tony Liu

Else l 20,201 0, in Calgary