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This symptom is very probably due to hardware checksums being used. If
you can disable it, please do so and attempt to reproduce the symptom.
** Changed in: libpcap (Ubuntu)
Status: New => Incomplete
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ethereal and tcpdump show a lot of packets with incorrect checksum
https://bugs.launc
** Changed in: libpcap (Ubuntu)
Assignee: Martin Pitt (pitti) => (unassigned)
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ethereal and tcpdump show a lot of packets with incorrect checksum
https://bugs.launchpad.net/bugs/31273
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I found this problem on a new server I built. This system acts as a local
router and DNS server, and also runs vmware-server. VMware is configured with
vmnet0 as a bridge to eth1, which physically links to a 10/100Mbps switch for
the local LAN.
VMware instances could communicate with the host
I solved my problem, some cards support checksum offload:
(
http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.prftungd/doc/prftungd/tcp_checksum_offload.htm
)
But sometimes it doen't compute the right checksum, Just issue the
following command and try again:
sudo ethtool -K
I can confirm this bug.
I was trying to set up a DHCP server on Ubuntu Feisty Fawn and I notice
that no responses were received from clients (also running Ubuntu), so I
uses wireshark to capture packets and seems that UDP Checksum are
incorrect, so offers get dropped.
I sent a message to dnsmasq
I've seen the same problem and can reproduce it. It
occurs when UDP packets are transmittted. I used
tcpdump's -X option to analyze the packets and
all fields are correct except for the UDP checksum.
In one test, I sent a single UDP packet between two
machines and found that only the checksum dif
Well, I came across
http://www.ethereal.com/faq.html#q11.1
but that only covers TCP. It's no solution to incorrect outgoing UDP (e.g. DNS)
checksums.
--
ethereal and tcpdump show a lot of packets with incorrect checksum
https://launchpad.net/bugs/31273
--
ubuntu-bugs mailing list
ubuntu-bugs@li
Me too. In Dapper, Ethereal says *all* outgoing TCP/UDP packets have a wrong
checksum, except for TCP ACK or SYN packets. I sampled DNS(UDP), HTTP and
SMB(TCP).
In Breezy, there was no such problem.
Dapper's Ethereal says that the data captured in Breezy is fine.
This happens independently of pro
