03-20-2009 12:10 PM - edited 03-06-2019 04:43 AM
HI every body!
I just want to ask one question. " don't fragment " bit is set or not set by default in ip header?
thanks a lot and have a nice weekend!
Solved! Go to Solution.
03-20-2009 12:13 PM
Usually its not set. However, some applications would default to setting it.
Thanks.
03-20-2009 12:29 PM
Sarah:
RFC 791 makes no mention of the default setting for the DF bit in the flags field of the IP header.
It depends on the application.
03-20-2009 01:20 PM
Here is what I saw
IP header from the host had DF set
IP header in a RIP response from the router
not set.
Thanks
Mat
03-20-2009 03:21 PM
In my experience there is not a generic default for the TTL. It is application or vendor dependent. I have seen a lot of implementations that start at 255, and quite a few that start at 64, and some start at 128.
HTH
Rick
03-20-2009 03:40 PM
The TTL is set to a value by the source that represents the maximum number of hops it wants for the datagram. Each router decrements the value; if it ever reaches zero the datagram is said to have expired and is discarded.
No default. The TTL is set by the application.
03-20-2009 12:13 PM
Usually its not set. However, some applications would default to setting it.
Thanks.
03-20-2009 12:29 PM
Sarah:
RFC 791 makes no mention of the default setting for the DF bit in the flags field of the IP header.
It depends on the application.
03-20-2009 01:20 PM
Here is what I saw
IP header from the host had DF set
IP header in a RIP response from the router
not set.
Thanks
Mat
03-20-2009 01:49 PM
Matt;
Im sure you're trying to convey a message with that post. What that message is, however, I have no idea! :-)
03-20-2009 02:24 PM
I was hoping the experts would explain the why and why not.
Apologize for the confusion.
03-20-2009 03:04 PM
Thanks all of you!
if you guys don't mind, i have a more question.
what is default value for ttl in ip header?
Thanks a lot and have a great weekend!
03-20-2009 03:21 PM
In my experience there is not a generic default for the TTL. It is application or vendor dependent. I have seen a lot of implementations that start at 255, and quite a few that start at 64, and some start at 128.
HTH
Rick
03-20-2009 03:40 PM
The TTL is set to a value by the source that represents the maximum number of hops it wants for the datagram. Each router decrements the value; if it ever reaches zero the datagram is said to have expired and is discarded.
No default. The TTL is set by the application.
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