Failure cause : Transaction Timeout to DNS

Hi,

please, what can all be a reason to have a Failure cause : Transaction Timeout (UE did not receive an answer from DNS, delayed too much ..)

Could it be due to some hugely mismatched timer value at GGSN side, if too short for example ...

What can be wrong on the path , some SW versions, HW , which settings ?

Radio network can be cause, i.e. bad coverage, for that can be made correlation betw. RSRP and throughput and failure causes occurred at the certain time stamp, but what else can cause timeout ?
How to dig more and where to troubleshoot it, Huawei vendor.

THX, P:)

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Originally Posted by punto

Hi,

please, what can all be a reason to have a Failure cause : Transaction Timeout (UE did not receive an answer from DNS, delayed too much ..)

Could it be due to some hugely mismatched timer value at GGSN side, if too short for example ...

What can be wrong on the path , some SW versions, HW , which settings ?

Radio network can be cause, i.e. bad coverage, for that can be made correlation betw. RSRP and throughput and failure causes occurred at the certain time stamp, but what else can cause timeout ?
How to dig more and where to troubleshoot it, Huawei vendor.

THX, P:)

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Locate problem in Gi/SGi interface. This is a main reason if DNS failure. Then radio optimize (Activate DRX).

Hi and thanx @live_energy !

If there were some cases of problems detected by trace of Gi/SGi interface, what were the case problems and how was it solved.
Just to get an idea , what it can be ...

Anyone else had similar problems, pls add your experience :)
THX , P:)

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Originally Posted by punto

Hi and thanx @live_energy !

If there were some cases of problems detected by trace of Gi/SGi interface, what were the case problems and how was it solved.
Just to get an idea , what it can be ...

Anyone else had similar problems, pls add your experience :)
THX , P:)

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Hey! Firstly check in SGSN-MME:

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The order of resolving domain names is as follows: Search for the records in the host file in the GTP process.If the related records do not exist, search for the records in the DNS cache in the GTP process.
After that, if no related records can be found, send a resolution request to the DNS server.

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This issue is resolved by adding the APN in SGSN via ADD IPV4DNSH, the parameter for this command as below:
Parameter ID  Parameter Name  Parameter Description
NM Host name This parameter specifies the configured host name, that is, the domain name.
Note: The domain name information in the HOSTFILE can be:
APN: APNNI.MNCyyyy.MCCzzzz.GPRS
The adjoining route area: RACaaaa.LACbbbb.MNCyyyy.MCCzzzz.GPRS
The adjoining RNC: RNCxxxx.MNCyyyy.MCCzzzz.GPRS
"yyyy" means the MNC, "zzzz" means the MCC, "y" and "z" are digits. "aaaa" means the RAC, "bbbb" means the LAC, "xxxx" means the RNC ID, they are hexadecimal numbers.
Value: a string of up to 255 characters
Default value: none

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Besides adding DNS host, this issue can be solving by adding host file or DNS cache in the GTP progress.

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