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How do you prevent IP datagram from being fragmented?
A IP datagram can be prevented from fragmentation, by setting the “don’t fragment” flag in the IP header. What happens when a datagram must be fragmented to traverse a network, but the “don’t fragment” flag in the datagram is set?
What is fragmented traffic?
IP fragmentation is an Internet Protocol (IP) process that breaks packets into smaller pieces (fragments), so that the resulting pieces can pass through a link with a smaller maximum transmission unit (MTU) than the original packet size. The fragments are reassembled by the receiving host.
Why is the ” don’t fragment ” flag set in?
The DF flag instructs routers who would normally fragment the packet due to it being too large for a link’s MTU (and potentially deliver it out of order due to that fragmentation) to instead drop the packet and return an ICMP Fragmentation Needed packet, allowing the sending host to account for the lower MTU on the path to the destination host.
What’s the safe value for the Don’t Fragment bit?
Inspecting the packet shows, that the “Don’t Fragment (DF)” Bit is set to 1. In my understanding this results in all packets greater than the MTU being dropped. 1500/1472 seems to be a reasonable safe value for the max package size, as many devices use a MTU 1500. Why was 1650 chosen?
Can a fragment be removed at run time?
The android developer site suggests the use of a FrameLayout to load fragments dynamically at run-time. You have hard-coded the fragment in your xml file. So it cannot be removed at run-time as mentioned in this link: http://developer.android.com/training/basics/fragments/fragment-ui.html
Why is my Android fragment not being replaced?
I had a similar problem but my issue was that I was using two different Fragment managers: One from getSupportFragmentManager () and one from getFragmentManager (). If I added one fragment with the SupportFragmentManager and then tried replacing the fragment with the FragmentManager, the fragment would just get added on top.