Cisco 857: Always lost the first ping !

[osgpcqosg]

Hi a was looking about a problem (https://supportforums.cisco.com/thread/2058182) and I found a strange bug with this modem and this version of IOS:

  857 Cisco IOS Software, C850 Software (C850-ADVSECURITYK9-M), Version 12.4(15)T14, RELEASE SOFTWARE (fc2)

I always use the "ping -c1 -M do -s 1472 xxx.xxx.xxx.xxx" from a linux box connected to the cisco adsl 857, so with this bug and the use of -c1 option, you get always bad result. 

Cisco just solve this issue in the:
  857 Cisco IOS Software, C850 Software (C850-ADVSECURITYK9-M), Version 12.4(15)T15, RELEASE SOFTWARE (fc3)

If you have the same problem, maybe this could help you...


Best Regards

[osgpcqosg]

If you don't want to do the upgrade to the last IOS you could use the "no ip cef" command. 
This command slove the problem.