[SOLVED] Netgear R6400V2 slow internet speed with new builds

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winproof
DD-WRT Novice


Joined: 23 Feb 2018
Posts: 2
PostPosted: Tue Jul 30, 2024 1:42    Post subject: [SOLVED] Netgear R6400V2 slow internet speed with new builds Reply with quote
Hello all!

i have a strange problem.

i use a Netgear R6400V2, with build r39538, work perfectly with vlan tag on WAN (needed for my ISP).

upload/download speed 800Mbps.

but now i need to connect my routeur to wireguard vpn, so i need to upgrade my build.

i've directly upgrade to r57595, no problem, except a capped internet speed?

now i have only 400Mbps... (tested with wired connection)

so, i downgrade to r54682, same problem.

i've try with vlan tag (ONT plugged on r6400) or without (r6400 plugged on isp box), no change.

same with ou without wifi activated, or after nvram erase & reboot.

if I go back to build r39538, problem disappears Shocked

any idea what caused it? Very Happy

Thanks!

Ps: sorry for my english, it's not my native language

Last edited by winproof on Tue Jul 30, 2024 10:40; edited 1 time in total
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lexridge
DD-WRT Guru


Joined: 07 Jun 2006
Posts: 1763
Location: WV, USA
PostPosted: Tue Jul 30, 2024 2:37    Post subject: Reply with quote
Have you tried enabling under the Basic Setup page, the Shortcut Forwarding Engine? Try each (SFE and CTF) and see if one works better than the other. I have not had a bdcm router connected to a WAN connection in many years so I don't know which may work best.
_________________
- Linksys EA8500: I-Gateway, WAP/VAP 5ghz only. Features: WDS-AP, VLANs, Samba, WG, Entware - r59171
- Linksys EA8500: 802.11s Secondary w/VLAN Trunk - r59171
- Linksys MX4300: 802.11s Primary w/VLAN Trunk over 5ghz. 2.4ghz WAP/VAP only - r59171
- Linksys MX4300 (WAP/VAP (7)) Multiple VLANs over single trunk port. Entware/Samba r59171
- Linksys MR7350: WDS Station for extended VLANs over Ethernet r59171
- Linksys Velop WHW03v1 x2: OpenWRT w/GRETAP tunnel for VLANs on VAPs
- OSes: Fedora 40, 10 RPis (2,3,4,5), 23 ESP8266s: Straight from Amiga to Linux in '95, never having owned a Windows PC.

- Forum member #248
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egc
DD-WRT Guru


Joined: 18 Mar 2014
Posts: 13499
Location: Netherlands
PostPosted: Tue Jul 30, 2024 7:24    Post subject: Reply with quote
I have one and you need to enable CTF and then CTF&FA

Reboot and you should get > 900 Mb/s but that only works if your WAN is automatic DHCP
See: https://wiki.dd-wrt.com/wiki/index.php/Hardware
under: Flow Acceleration, SFE and Cut-Through Forwarding
_________________
Routers:Netgear R7000, R6400v1, R6400v2, EA6900 (XvortexCFE), E2000, E1200v1, WRT54GS v1.
Install guide R6400v2, R6700v3,XR300:https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=316399
Install guide R7800/XR500: https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=320614
Forum Guide Lines (important read):https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087
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winproof
DD-WRT Novice


Joined: 23 Feb 2018
Posts: 2
PostPosted: Tue Jul 30, 2024 10:40    Post subject: Reply with quote
ok it's work, perfect.
Thanks!
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