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TCP-MSS

TCP-MSS

Created: Mar 27, 2020 17:32:39Latest reply: Mar 31, 2020 16:31:44 774 11 0 0 0
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Hello,


I need to change TCP MSS value on NE20E-S2F on it's interfaces connected to my transit IP provider.


Do you know how to perform that?


Best Regards

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Popeye_Wang
Admin Created Mar 28, 2020 00:54:53

Hi,

You can use the tcp adjust-mss inbound command to set the MSS of an interface.

Example

# Set the MSS to 1450 bytes for the TCP SYN/SYN+ACK packets received by 0/2/0.1.


[~HUAWEI] interface Gigabitethernet 0/2/0.1
[~HUAWEI-GigabiteEhernet0/2/0.1] tcp adjust-mss 1450 inbound


Refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=tcp_adjust-mss_inbound&lang=en


Any further questions, let us know.


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mrod
mrod Created Mar 30, 2020 18:26:54 (0) (0)
It didnt work, I've applied this command to my link provider's interface and took a look at this page: https://www.speedguide.net/analyzer.php without sucess  
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wissal
wissal MVE Created Mar 27, 2020 17:38:33

Hello,

Of course, sometimes to avoid unfragmented packets discarded, reasonable adjustment of MTU/MSS is necessary.


The command for adjusting the MTU value of an interface or a tunnel is just mtu.

please refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=mtu&text=null&lang=en.


And the command for adjusting the MSS value is tcp adjust-mss.

https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=tcp_adjust-mss&text=null&lang=en

You can also use the tcp max-mss command to set the maximum MSS value for a TCP connection.

https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=tcp_max-mss&text=tcp max-mss&lang=en


Thanks

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mrod
mrod Created Mar 27, 2020 17:58:09 (0) (0)
Hello,

But how do I apply the virtual temple to a physical ou bunde-ether interface?  
wissal
wissal Reply mrod  Created Mar 27, 2020 20:04:04 (0) (0)
Please follow the link below to get the desired information:
https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=mtu&text=null&lang=en.  
mrod
mrod Reply mrod  Created Mar 30, 2020 18:29:30 (0) (0)
Hi,
This link is about MTU not MSS  
wissal
wissal Reply mrod  Created Mar 30, 2020 19:19:14 (0) (0)
Hope to help you next time, you are welcome in the community  
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3#
Popeye_Wang
Popeye_Wang Admin Created Mar 28, 2020 00:54:53

Hi,

You can use the tcp adjust-mss inbound command to set the MSS of an interface.

Example

# Set the MSS to 1450 bytes for the TCP SYN/SYN+ACK packets received by 0/2/0.1.


[~HUAWEI] interface Gigabitethernet 0/2/0.1
[~HUAWEI-GigabiteEhernet0/2/0.1] tcp adjust-mss 1450 inbound


Refer to https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=tcp_adjust-mss_inbound&lang=en


Any further questions, let us know.


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mrod
mrod Created Mar 30, 2020 18:26:54 (0) (0)
It didnt work, I've applied this command to my link provider's interface and took a look at this page: https://www.speedguide.net/analyzer.php without sucess  
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4#
Popeye_Wang
Popeye_Wang Admin Created Mar 31, 2020 13:21:57

Posted by Popeye_Wang at 2020-03-28 00:54 Hi,You can use the tcp adjust-mss inbound command to set the MSS of an interface.Example# Set the MS ...

This command can only limit the MSS in the inbound direction. I think you're hoping to limit the outbound mss.
You can run the tcp max-mss command in the system view to set the MSS value of all TAC connections.
Alternatively, you can set the MTU value on the interface.  MSS = MTU - 40

https://support.huawei.com/hedex/hdx.do?docid=EDOC1100075578&id=mtu&lang=en


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mrod
mrod Created Mar 31, 2020 16:44:00 (0) (0)
Hello,
According to this link https://support.huawei.com/enterprise/br/knowledge/EKB1100012281 tcp max-mss just affects segments that are originated my router itself.
Thanks for your help  
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5#
Saqib123
Saqib123 Created Mar 31, 2020 16:31:33

hmmm
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Saqib123
Saqib123 Created Mar 31, 2020 16:31:44

good question
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