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Hi Olivier,
Yes I using Enhanced MX SCB 3
#run show forwarding-options hyper-mode
Current mode: hyper mode
Configured mode: hyper mode
user-lo...@mx960.ol.lax.rnbn.net.RE0# show forwarding-options hyper-mode
{master}[edit]
Exactly it is running in hyper mode by default
I'll try to disable hyper mode If working fine, it means that hyper mode does
not support TCP-MSS adjust. ya It's not documented.
I will share it if I got any results later.
Cheers
On Apr 17, 2021, at 12:52 AM, Olivier Benghozi
<olivier.bengh...@wifirst.fr<mailto:olivier.bengh...@wifirst.fr>> wrote:
MPC10. SCBE3? SCBE3 => hyper-mode by default.
As there's no hypermode firmware in MPC-16x10, only the MPC10 would really be
in hyper mode, and therefore the firmware loaded in the MPC10 would be the
faster hypermode one, while the firmware in the 16x10 will still be the
standard one with all the features.
I wonder if tcp-mss is expected to work in Hyper-Mode, in fact. It's not
documented... but this would explain a difference of behaviour between both
cards.
You should try:
show forwarding-options hyper-mode
Of course if you're in standard mode and/or not using SCBE3, these thinkings
are to be thrown away :)
Le 16 avr. 2021 à 05:53, Louis Ho via juniper-nsp
<juniper-nsp@puck.nether.net<mailto:juniper-nsp@puck.nether.net>> a écrit :
De: Louis Ho <lo...@rootglobal.com<mailto:lo...@rootglobal.com>>
Objet: TCP-MSS adjust does not work on MPC10E
Date: 16 avril 2021 à 05:53:13 UTC+2
À: "juniper-nsp@puck.nether.net<mailto:juniper-nsp@puck.nether.net>"
<juniper-nsp@puck.nether.net<mailto:juniper-nsp@puck.nether.net>>
Does MPC10E support changing TCP-MSS on transit packets?
Today I need to set TCP-MSS to 1400,
My topological map
Server A > EX4300 A > MX960 A xe-4/0/0> > EX4300 B > server B
Serve A > EX4300 A > MX960 A et-5/0/0 > QFX-5110 > EX4300 C > server C
There are two line cards on my MX960 router, MPC 3D 16x 10GE and MPC10E 3D
MRATE-10xQSFPP
I have configured tcp-mss on the two MPC interfaces, but the mss will only be
adjusted if the traffic passes through xe-4/0/0,
but the traffic through et-5/0/0 does not work, the mss still keep at 1460.
show interfaces xe-4/0/0 | match mss
tcp-mss 1400;
tcpdump by serverB
https: Flags [S], seq 3239034622, win 29200, options [mss 1400,sackOK,TS
show interfaces et-5/0/0 | match mss
tcp-mss 1400;
tcpdump by serverC
Flags [S], seq 3355130726, win 29200, options [mss 1460,sackOK,TS val
Cheers
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