[ns] Re: Urgent-concerned with emulation

[Alefiya Hussain]

> Hello hussain,
> i am manjunath and am right now working on emulation under NS.
> 1-I tried the emping.tcl and the problems i faced were-
> a-I ping m/c B from m/c A.....and my m/c B runs emping.tcl(hence PingResponder).I have a 10second delay between the link connecting the node to which bpf(filter)entry node and the node(PingResponder) in the ns environment. 
> How does m/c A get replies for ping's within 0.500 ms??
> Does that mean that m/c B replies and the PingResponder doesn't???
> Or if a copy is made by BPF...then why don't i see a reply after about 20 seconds on m/c A?
>> Also...if i have an intermediate node between my BPF and
>PingResponder...the ping doesn't reach the pingResponder...why????

i think B replies not the pingresponder.  you need to make sure the kernel 
does not answer for the pingresponder IP. 
  
>> 2-In the tcpemu.tcl example i get error msgs saying "BAD ACK for our
>SYN"....can you tell me why???Isn't the write operation working??

Most probably means the ACK numbers are not matching.

best,
alefiya