Igmp Packet Checksum Error
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network admin and I've got from them the info that everything is OK on the network side I'll need your help to investigate what's going on. I've started the capture and most header checksum 0x0000 incorrect should be ip checksum offload of the packets had the Checksum error, I've deactivated this filter as per some incorrect checksum tcpdump other post recommendation to see what is left and I can see a couple of packets, when i go to ip checksum offload windows 7 detail window expand the Internet Protocal and the Header, it shows a red highlight on the Header and then on Bad:True, also says Header checksum: 0x0000 [incorrect, should be 0x822f], this 0x822f is replaced
Wireshark Checksum Error
by many other numbers for the other packets. Can you help me on this troubleshoot? I can post the capture if necessary. Regards, WRIBEIRO checksum wireshark This question is marked "community wiki". asked 13 Aug '12, 04:09 WRIBEIRO 6●1●1●3 accept rate: 0% 2 Answers: oldestnewestmost voted 1 Please check if the packets with checksum errors are packets your machine is sending out to the network. If they are, header checksum validation disabled and none of the incoming packets have errors, you can ignore these CRC error messages - they're a result of you capturing your own traffic locally with network card optimizations enabled. Especially the 0x0000 is a typical value for a placeholder when the NIC does the checksum calculation later (after Wireshark captured the packet already). link answered 13 Aug '12, 04:22 Jasper ♦♦ 21.7k●4●49●260 accept rate: 18% There you go, when I sort if from my machine the error comes up, when i sort from my "destination" it goes away. Less one problem. Now i need to find out why, it's so slow. I have a bunch of TPKT - Continuation coming from my server. And also a lot of TCP segment of a reassembled PDU, any clue on that? (13 Aug '12, 06:06) WRIBEIRO "Segment of a reassembled PDU" is not an error, it is a message that Wireshark considers the packet being a part of a larger payload. You can disable the packet reassembly in the TCP protocol preferences by unchecking "Allow subdisector to reassemble TCP streams". Continuation messages are a similar thing - Wireshark tells you that the packet contains more parts of a payload. If you try to
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Wireshark Checksum Validation Disabled
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Tcp Bad Checksum
developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is https://ask.wireshark.org/questions/13577/header-checksum-error-incorrect-should-be a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up IGMP Join message gives wrong checksum up vote 0 down vote favorite I'm trying to connect to a multicast group to receive some UDP packets. The code I'm using is working good, http://stackoverflow.com/questions/15273186/igmp-join-message-gives-wrong-checksum I'm receiving the packets and I haven't had a problem with this before. But just now there is a new requirement that needs the packets to pass through a switch which needs to see the Multicast join message. Before it has just been dumb switches and this hasn't been a problem. To join the multicast group, I use this code: var LocalAddress = "228.12.12.27"; var LocalPort = 46715; var LocalEndPoint = new IPEndPoint(IPAddress.Parse(LocalAddress), LocalPort); var RxSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); RxSocket.Blocking = false; RxSocket.ReceiveBufferSize = UInt16.MaxValue; RxSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, 1); RxSocket.Bind(new IPEndPoint(IPAddress.Any, LocalEndPoint.Port)); RxSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(LocalEndPoint.Address)); RxSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.MulticastTimeToLive, 50); RxSocket.Close(); The line that generates the IGMP Join message is RxSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(LocalEndPoint.Address)); And the IGMP Join message is sent out. However, as I snoop the network with Wireshark, I see that the IGMP message has a bad checksum; Is this a problem with my code, or the input? Or is there something else? c# s
Join INTELLIGENT WORK FORUMSFOR COMPUTER PROFESSIONALS Log In Come Join Us! Are you aComputer / IT professional?Join Tek-Tips Forums! Talk With Other Members Be Notified Of ResponsesTo http://www.tek-tips.com/viewthread.cfm?qid=223358 Your Posts Keyword Search One-Click Access To YourFavorite Forums Automated SignaturesOn Your http://www.juniper.net/techpubs/software/cable/junosg30/swconfig30-interfaces/html/cable-config40.html Posts Best Of All, It's Free! Join Us! *Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting Guidelines Promoting, selling, recruiting, coursework and thesis posting is forbidden.Tek-Tips Posting Policies Jobs Jobs from Indeed What: Where: jobs by Link To This checksum error Forum! Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.Just copy and paste the BBCode HTML Markdown MediaWiki reStructuredText code below into your site. Cisco: Routers Forum at Tek-Tips HomeForumsCommunications RackNetworkingCisco: Routers Forum IGMP: packet checksum error thread557-223358 Forum Search FAQs Links MVPs IGMP: packet checksum error IGMP: packet checksum error Nightcrawler (TechnicalUser) (OP) 4 Mar ip checksum offload 02 08:58 Hiya,I am trying to use some software which uses Multicasting. I have a Cat 6006 with MSFC and Sup Enginer 1A. However in the debug I am getting this message...IGMP: packet checksum errorI can't find any information relating to it thou ??Thanks for any helpEd Red Flag This Post Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. Cancel Red Flag SubmittedThank you for helping keep Tek-Tips Forums free from inappropriate posts.The Tek-Tips staff will check this out and take appropriate action. Close Reply To This Thread Posting in the Tek-Tips forums is a member-only feature. Click Here to join Tek-Tips and talk with other members! Resources Join | Indeed Jobs | Advertise Copyright © 1998-2016 ENGINEERING.com, Inc. All rights reserved.Unauthorized reproduction or linking forbidden without expressed written permission. Registration on or use of this site constitutes acceptance of our Privacy Policy. Close Box Join Tek-Tips Today! Join your peers on the Internet's largest technical computer professional community.It's easy to join and it's fr
to Layer2 units. The first IGMPv1 or IGMPv2 membership report (solicited or unsolicited) received on an upstream interface for any multicast group is always forwarded to the network side interface (NSI) and any downstream interfaces that are part of that multicast group. The multicast group membership (obtained by snooping the report) and the associated downstream interface are saved in the multicast group membership table as a dynamic entry (subject to a timeout). Any additional membership reports received are forwarded only to the NSI as long as the query response interval has not expired. The multicast group membership table is used to forward multicast traffic to only those downstream interfaces that belong to the multicast group. A maximum of 64 multicast IP addresses are saved for each downstream interface. A group membership interval timer is maintained for each dynamic (snooped) multicast group added to a downstream interface in the table (see Configure the IGMP Group Membership Interval for more information). The timer is refreshed when a membership report for a multicast group is received. If the timer expires, the multicast group is removed from the table. If an IGMPv2 leave message is received on an upstream interface, the CMTS forwards it to the NSI without changing any entries in the table. You can remove dynamic multicast groups from the multicast group membership table by issuing the clear cable multicast-group command. To display the table, issue the show cable multicast-group command. See the JUNOSg Software Operational Mode Command Reference for more information. The multicast group membership table is persistent across CMTS reboots. The valid range of multicast IP addresses is 224.0.0.0 through 239.255.255.255. All downstream interfaces belo