LTE Call Flow - Wireshark (Pcap) analysis of LTE UE Attach

[@shubha07m]

This is the best explanation of LTE call flow using Wireshark capture I've ever seen, this is immensely helpful!

[@nasarahmad]

Brilliant stuff__! This is the only resource where you'll see flow of messages & their purpose together with interface & protocol. Beautifully explained. Much appreciated

[@sudhanshukumar3822]

This is very useful and best video on the KZbin pf LTE Attach call flow

[@modilalarun1238]

Excellent explanation, it's very clear and easy to understand. Please post more videos . Thanks for the information. 👍

[@Sandeepy156]

During inter 3GPP handovers which are the interfaces are created between release 8 SGSN to connect with LTE EPC SGW & MME? A. S3/S4 B. S1/S5 C. All of Above D.None of the above If you know the answer can you answer got it this from my college exam

[@yascarpharmacyltd9344]

Very good detailed presentation, I have been searching for something like this for a while. Thanks.

[@bidhanpatel3987]

Excellent !! Well explained step by step with required info !!!

[@ForzaSyria]

thank you brother .. it's really useful :)

[@balkrishnasrivastava9258]

Best explanation for attach procedure thanks sir

[@wirelessnerd7131]

Very well put together. Thank you.

[@balkrishnasrivastava9258]

amazing explained sir with log ....thanks, like this please make RACH procedure also.......

[@electricaladvisorabhinov9884]

GOOD EXPLABATION BUT PLS STOP DRINKING WATER IN BETWEEN

[@prasadkeshav4371]

Very well explained 👏👌👍

[@dheerendraprasad2020]

will u provide the wiresharks log from node

[@AhmedKhan-du3lg]

At 11:47 it is mentioned that RAT/VPLMN/IMSI info is transferred in the in the AIR request, but later at 14:18 the same info (RAT/VPLMN/IMSI) is getting transferred in the ULR. I think the later case is true .

[@kenezmorotz6490]

Dear Sir, thanks for the video. Could you tell me how was the capture gathered?

[@cibinnv9059]

Greatest explanation.. Thanks a lot sir.. Got much better idea now.. Pls continue posting more videos.. Really a great explanation. Expecting more videos from you.

[@atahanaltuntas6164]

Very very good video. I just have one confusion, in Initial Context SetUp Message, MME transfers the SGW GTP TEID and SGW IP to ENB for ERAB set up. So it is for user plane. And in Initial Context Setup Response message, eNB transfers GTP TEID and IP of EnodeB. Then why in last step, SGW informs in Modify Bearer Response message about it's GTP TEID and IP address? MME shall know it in initial Create Session Response message i guess? Thanks for your answer in advance

[@SAURABHJAIN1989]

I always have this doubt: what is the "initial UE message"? I mean IP of phone / device or what exactly certain numbers or kind of data UE send to MME?

[@balkrishnasrivastava9258]

Please make same for enodeb handover procedure

[@praveensrivastava5537]

its much helpful..thanks sir

[@AliKh-kt1ip]

please drink on the other side of the microphone 😂😂😂😂

[@ilovesourav]

25:55 slip of the tongue. It is Attach Complete and not Attach Accept. But, overall, an amazing quick byte to brush up before interviews.

[@porapooka]

Can we get similar type of video for IMS to IMS calls with call flows explanation and examples....

[@shubhamtayade1759]

Attach Accept msg sent by MME to UE and not from UE to MME.

[@mubarikali8369]

thanks dear for your help and explanation

[@AsimKhatim]

Great Explanation. Keep up the good work, and I look forward for more videos from you

[@sureshgoondla1917]

PCRF is not involved in the LTE initial attach?

[@Jitender_Dhankhar]

very well explained sir thank u :)

[@Winstonsmith1984ingsoc]

can you upload tau/rau procedure pcap analysis?

[@dominiquebamouni6787]

Very Good explanation. Would you please share the Wireshark packets capture, please. Would like to check to further understand the process. Thank you in advance.

[@ashishkumbhar9741]

Please share the same on IMS call flow

[@jaydip6355]

please add on PCRF call flow with it, thanks

[@Sandeepy156]

During inter 3GPP handovers which are the interfaces are created between release 8 SGSN to connect with LTE EPC SGW & MME? A. S3/S4 B. S1/S5 C. All of Above D.None of the above

[@morhareach7315]

How do I know that UE attached in 4G,2G or 3G? Can you tell me by looking in this flow?

[@Sandeepy156]

The eNode transmite e Responee message to a preamble using which of the following? Select the best 1 Pot Channel 2 Downlink Control Channel and Shared Channel 3 Shared Channel 4 Paging Channel 5 Data Channel

[@irfanshiekh1874]

Master peice

[@unnikrishnanvh5251]

Very useful and nice explanation Can someone tell me in which message the UE gets its IP address from the PGW. Is it from the Create Session Response?

[@suryabh18]

CS response will have the UE IP.

[@arcert6743]

Thank you. Excellent explanation and very helpful in understanding the concepts. Can you please guide how the roaming scenarios work while mobile is moving from one operator to another and how S8 interface PGW is selected. Thanks

[@malikyaser1]

If SGW connect with different PGW that is belong to different user plan in RAN it connect via protocol S8.

[@bhavinjoshi6780]

Excellent video Sir!!! Many many thanks!!! It would be very very helpful.

[@manojghongade7095]

This is really good Video with Wireshark Trace analysis. Request you to put similar video for VoLTE end to end call with wireshark trace so it would be great help

[@krishnabonthu312]

Hi Surya, Nice explanation. Thank You.

[@furcamarius9406]

Very usefully explanation. Can you please share also for Gx/Gy flows a similar one? Best regards!

[@jacquelinegomez1011]

This is awesome! Do you happen to have another video that includes a purge request & answer in a s1ap trace & discussing important key factors?

[@nainglinn1745]

The best explanation 🎉🎉🎉!

[@nsivachidambaram]

Expecting more videos from you .. very Good explanation with samples ...

[@resoldab]

Very precise and detailed explanation, it has helped me greatly.

[@mohammedfiguig1204]

Best explanation, Thanx,

[@AbdurRahman-po4wg]

Thanks. Well explained.

[@gucheddie3204]

thank you for sharing - i am just starting my LTE journey and this was very helpful

[@basherpvpv3907]

Great thank you...expect more videos like this..

[@sunilthakur7481]

Best explanation👍

[@hariharanmurali9613]

This video is remarkable! Kudos to you

[@saravanakumarkamalakannan9747]

Good explanation in a simple way . . keep up the good work ....thanks

[@vaishnavijadhav3002]

Nothing is visible

[@shajeedsk7702]

A very good explanation.!. Will be very much helpful if you provide the .pcap files. Thanks in advance.

[@suryabh18]

Glad u found the video useful. Sorry can't share the raw pcap due to Privacy related concerns. Cheers!

[@sajithnallithodi]

Wonderful. Thank you very much for the lucid explanation.

[@malakondaiah1512]

Can u upload x2HO,S1HO,csfb,srvcc ,volte,MIMO,CA, wireshark videos

[@persiusonime1509]

Simply the best. It comes natural. Very coincise

[@rohitkumara2802]

❤

[@Crossyourboundaries]

very well explained

[@Harshitgupta-qw2yc]

Thanks

[@danylunny8142]

Thank you. wonderful explanation.

[@rkvizag_USA]

Great explanation!

[@rakeshvarma9424]

superb

[@raghavchakravorthy3896]

where to find this pcap file

[@moyukh2007]

ultimate lte attach explained , many thanks

[@ISDANA1]

Excellent Master. Admirable. I feel motivated to learn more. Congratulation

[@suryabh18]

Thanks Claudia. Glad you found the explanation useful

[@syauqisabili3776]

When i analyzed my pcap file, i get problem that MME closed sctp connection because enodeB(s1aptester) sent ICMP message to MME instead of HEART ACK. do you know why?

[@suryabh18]

Does your enodeB already have a S1 connection established ? Sounds like not.

[@syauqisabili3776]

@@suryabh18 thank you for your reply sir, The log of mme shows 'eNB-S1 accepted' twice. first in s1_path module second in master_sm module after that, Attach request. and the last message is 'eNB-S1[a] connection refused!!!'. these are my files (nextepc.pcap and s1ap.pcap), i hope that your suggestions could help me. drive.google.com/drive/u/0/folders/1mQrEkd10zRALzAaTY3ul9p_nv64r0efw Thank you very much and sorry for disturbing your time.

[@suryabh18]

@@syauqisabili3776 Looked at ur captures. So it seems like SCTP end point on eNB becomes unreachable after the initial attach success. I doubt this is related to the attach. When the enb is in this condition can you verify connectivity to the SCTP port 36412 - some useful commands - www.cyberciti.biz/faq/ping-test-a-specific-port-of-machine-ip-address-using-linux-unix/

[@syauqisabili3776]

@@suryabh18 thanks for your reply sir, I've verified using nping while the condition s1ap is running, the result works properly. (but when im running s1ap, then close automatically without press ctrl+c) when i ran this command on nextepc vm $ sudo netstat --sctp -tulpn one of result shows, sctp 192.168.10.210:36412 LISTEN

[@suryabh18]

@@syauqisabili3776 so you are saying the sctp is healthy on 192.168.10.70 (enb side) under when it does not send a HB_ACK ? If yes, I am not sure what kind of networking you have but maybe worth checking an firewall rules etc. Also u can change sctp settings on both end points to send multiple HB chunks if one does not succeed. Check the vendor doc for exact parameter names. Hope this helps.

[@pajtimi6265]

Can we have the .pcap file please ?

[@tejas_bodhe]

in which msg PGW allocates IP address to UE

[@suryabh18]

Create session response

[@smrutiranjan588]

Thank u

[@DeepakSingh-mj9jw]

nice explanation

[@anupdevlikar103]

Loved it !!

[@malakondaiah1512]

Good information,tq u

[@santhoshreddygogula2768]

bro call logs are not clear

[@2812manish]

Nice explanation, but it seems that instructor is speaking while with eating something, and it sounds very annoying.

[@ashwinilakade936]

Same issue ....it's irritating ...😐

[@samtnvideos2918]

How can we view these analysis in wire shark , as I have pcap file but I am not getting those messages can any one help

[@suryabh18]

Hello, you should be able to filter by protocol in wireshark

[@samtnvideos2918]

What filter we need to apply

[@shajeedsk7702]

Hi, please provide the .pcap files if you can. Thanks!

[@travellingguitarsinger]

can you share the sample pcap please?

[@suryabh18]

Sorry Amit I can’t share these since there is some proprietary and confidential information in these logs. Thanks for your understanding.

[@travellingguitarsinger]

@@suryabh18 Understood, Thanks for quick reply.

[@suryabh18]

You can downlead some sample PCAPs from - blog.colte.network/pcap-library/

[@anshgupta8065]

Please make video on python & c Programming ,which is used in protocol development /testing with interview question in C.

[@armurray359]

Good tutorial, but the periodic slurping of whatever he's drinking is driving me nuts 😢.

[@amitdhamija222]

Awesome

[@raghavshere]

Would you please stop slurping in between your videos .. It's so irritating . Otherwise from content point of view .. your work is nice .