![Cisco asa asdm dhcp reservation](https://kumkoniak.com/117.png)
Next, select the Advanced tab and enter the new MTU value, as shown in Figure 3-21. To adjust the interface MTU from ASDM, first select Configuration > Device Setup > Interfaces, select an interface, and click the Edit button. Ideally, the MTU should be increased on every network device and interface along the entire data path. In some cases, you might need to reduce the MTU to avoid having to fragment encrypted packets where the encryption protocols add too much overhead to an already maximum-sized packet. If packets larger than 1500 bytes are commonplace in a network, you can increase the MTU size to prevent the packets from being fragmented at all.
![cisco asa asdm dhcp reservation cisco asa asdm dhcp reservation](https://i.ytimg.com/vi/sA2zs9TSJSo/maxresdefault.jpg)
As well, data centers often leverage Ethernet “giant” or “jumbo” frames, which are much larger than normal, to move large amounts of data efficiently.
![cisco asa asdm dhcp reservation cisco asa asdm dhcp reservation](https://islandearthweb.files.wordpress.com/2015/07/cisco_nat2.png)
Various IEEE standards use expanded frame sizes to carry additional information. Normally, the default 1500-byte MTU is sufficient because Ethernet frames are limited to a standard maximum of 1500 bytes of payload data. The whole fragmentation and reassembly process takes time, memory, and CPU resources, so it should be avoided if possible. And before the packet can be presented at the destination, all of its fragments must be reassembled in their proper order.
![cisco asa asdm dhcp reservation cisco asa asdm dhcp reservation](https://www.cisco.com/c/dam/en/us/support/docs/security/pix-500-series-security-appliances/70391-pix-asa-dhcp-svr-client-7.gif)
If a packet is larger than the MTU, it must be fragmented before being transmitted. By default, any Ethernet interface has its maximum transmission unit (MTU) size set to 1500 bytes, which is the maximum and expected value for Ethernet frames.
![Cisco asa asdm dhcp reservation](https://kumkoniak.com/117.png)