udp packet

[Qingqing]

Hi all,

When I use UdpEchoSever/Client, every time it shows "Header checksum:
0x0000 [incorrect, should be 0x60cd]" or something like that in the
pcap files, even the example. How can I fix this problem?

Thanks.

[qingmei yao]

And when you use wireshark to look at the pcap files. It refers "6    0.015837    10.1.1.2    10.1.1.1    UDP    Source port: discard  Destination port: 49153". So I wonder what is the normal one, since I have never seen.

[sen]

Just because ns-3 disable the checksum, you can enable it by
GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));

in ns-3.8:
CalcChecksum attribute changes
Four IPv4 CalcChecksum attributes (which enable the computation of
checksums that are disabled by default) have been collapsed into one
global value in class Node. These four calls:

Config::SetDefault ("ns3::Ipv4L3Protocol::CalcChecksum", BooleanValue
(true));
Config::SetDefault ("ns3::Icmpv4L4Protocol::CalcChecksum",
BooleanValue (true));
Config::SetDefault ("ns3::TcpL4Protocol::CalcChecksum", BooleanValue
(true));
Config::SetDefault ("ns3::UdpL4Protocol::CalcChecksum", BooleanValue
(true));

are replaced by one call to:
GlobalValue::Bind ("ChecksumEnabled", BooleanValue (true));

[qingmei yao]

Got it, thanks:).

2010/6/25 sen <guisen...@gmail.com>

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