How to generate icmp packets with increamented sequence number

[jigs9...@gmail.com]

Hi,

 

Can anyone please suggest me how to generate ICMP stream with increamented sequence number. I tried to generate ICMP stream but I always get seq no as '0'.

 

ICMP 60 Echo (ping) request  id=0x04d2, seq=0/0, ttl=127

ICMP 60 Echo (ping) request  id=0x04d2, seq=0/0, ttl=127

ICMP 60 Echo (ping) request  id=0x04d2, seq=0/0, ttl=127

ICMP 60 Echo (ping) request  id=0x04d2, seq=0/0, ttl=127

 

In ''Internet Control Message Protocol' feild I kept sequence as '0'. Do I need to set this to have icmp packets with increamented sequence number?

 

Thanks and regards

Jigar

[Srivats P]

As implemented currently the ICMP protocol builder doesn't allow you
to increment the sequence number. You can instead use a userscript to
simulate ICMP and populate incrementing sequence number.

You will need to use the advanced mode to populate the list of
protocols in the stream - use "UserScript" instead of ICMP and use the
below userscript -

protocol.protocolFrameSize = function() { return 8; }

protocol.protocolFrameValue = function(index)

{

var type = 8; // Echo Request

var code = 0;

var id = 0x9127; // example value

var seq = 0x1234+index; // example value

var sum = (type << 8 | code) + id + seq + (0xFFFF &
~protocol.protocolFramePayloadCksum());

var pfv = new Array(8);

pfv[0] = type;

pfv[1] = code;

while(sum>>16)

sum = (sum & 0xFFFF) + (sum >> 16);

sum = ~sum;

pfv[2] = sum >> 8;

pfv[3] = sum & 0xFF;

pfv[4] = id >> 8;

pfv[5] = id & 0xFF;

pfv[6] = seq >> 8;

pfv[7] = seq & 0xFF;

return pfv;

}

protocol.protocolId = function() { return 0x1; }

protocol.protocolFrameValueVariable = false;

protocol.protocolFrameVariableCount = 10;

Srivats

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