|
Cisco ASA MTU and MSS Config Settings
MTU = Maximum Transmission Unit
MSS = Maximum Segment Size
Ethernet MTU (default) = 1500 Bytes
Ethernet MSS (default) = 1460 Bytes (MTU-40)
Tunneled MSS (default) = 1380 Bytes (MTU-120)
Here is how you find your Cisco ASA's MTU and MSS settings.
cisco# sh ru | inc mtu
mtu outside 1500
mtu inside 1500
mtu management 1500
cisco# sh run all | inc tcpmss
sysopt connection tcpmss 1380
sysopt connection tcpmss minimum 0
If you believe you are having MTU problems, use the ping
to find out your necessary MTU and MSS. Under Windows use
'ping -f -l [size] [host]' with decreasing values
for to see when packets stop fragmenting.
- Scotech
| 
