Archer C7 V2 recommended build - 2021

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mvrk
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Joined: 20 Oct 2009
Posts: 25

PostPosted: Wed Oct 13, 2021 14:13    Post subject: Archer C7 V2 recommended build - 2021 Reply with quote
Hi,

I've not updated my firmware in a long time, i'm running r33772.

Can someone recommend me which more recent version is working fine without problems?
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Alozaros
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Joined: 16 Nov 2015
Posts: 4630
Location: UK, London, just across the river..

PostPosted: Wed Oct 13, 2021 14:55    Post subject: Reply with quote
usually the last is the best, as it contains all new security fixes, currently 47528

P.S. my 1043v2 works ok on 47528, it has the same SoC as Archer C7 v2, apart of Archer has an extra 5Ghz radio and a bit more flash size ram...and working RAM..
where Archer C7 v5 is totally different SoC to compare to its 'last ok build'...both C7 v2 and v5 are different...

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Atheros
TP-Link WR740Nv1 ---DD-WRT 47528 BS AP,NAT
TP-Link WR1043NDv2 -DD-WRT 47528 BS AP,NAT,AP Isolation,Ad-Block,Firewall,Local DNS,Forced DNS,DoT,VPN,VLAN
TP-Link WR1043NDv2 -DD-WRT 47528 BS AP,NAT,Ad-Block,Firewall,Local DNS,Forced DNS,DoT,VPN,VLAN
TP-Link WR1043NDv2 -Gargoyle OS 1.13.0b AP,NAT,QoS,Quotas
Qualcomm Atheros/
Netgear R7800 --DD-WRT 47581 BS AP,NAT,AD-Block,AP&Net Isolation,VLAN's,Firewall,Local DNS,DoT,Vanilla
Netgear R9000 --DD-WRT 47581 BS AP,NAT,AD-Block,AP Isolation,Firewall,Local DNS,DoT,2,4Ghz only,Vanilla
Broadcom
Netgear R7000 ---DD-WRT 47581 BS AP,Wi-Fi OFF,NAT,AD-Block,Firewall,Local DNS,Forced DNS,VLAN's,DoT,VPN
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Last edited by Alozaros on Thu Oct 14, 2021 7:45; edited 1 time in total
egc
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Joined: 18 Mar 2014
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PostPosted: Wed Oct 13, 2021 15:02    Post subject: Reply with quote
I do not have your router so cannot give a definitive answer but the forum guidelines should get you going:
https://forum.dd-wrt.com/phpBB2/viewtopic.php?t=324087

Those will show you how to research your router, where to find builds etc.

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kernel-panic69
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Joined: 08 May 2018
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PostPosted: Thu Oct 14, 2021 1:30    Post subject: Reply with quote
Well, it seems that some folks are saying 46935 is the last "stable" build for the C7 (v5). Still not sure if it's a matter of wireless configuration or what.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1248380#1248380

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the-joker
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PostPosted: Thu Oct 14, 2021 7:11    Post subject: Re: Archer C7 V2 recommended build - 2021 Reply with quote
mvrk wrote:
Hi,

I've not updated my firmware in a long time, i'm running r33772.

Can someone recommend me which more recent version is working fine without problems?


Hello there.

Somewhat a loaded question, without problems is subjective as it depends on your setup.

I would first start with build r46935 suggested by Kernel-panic69, observing the upgrade methods.

Then setup for your purposes, what you need, I would start from scratch with such old builds you start from.

Now if you notice this works OK feel free to backup your nvram, then upgrade to the very latest (because security fixes are likely to be included), I suggest something newer than r47528 but by the time you tested the suggested build, one should be out anyway.

Good luck.

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herkow
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Joined: 12 Apr 2013
Posts: 19

PostPosted: Sat Oct 16, 2021 1:12    Post subject: Reply with quote
kernel-panic69 wrote:
Well, it seems that some folks are saying 46935 is the last "stable" build for the C7 (v5). Still not sure if it's a matter of wireless configuration or what.

https://forum.dd-wrt.com/phpBB2/viewtopic.php?p=1248380#1248380



Hi guys, I like to help as much as possible so here's my configuration (46935) wich is not working on 47xxx.

Basic Setup:

-Ignore WAN DNS +
-Forced DNS Redirection +

Everything else, default.


Wireless (best QCA WiFi settings as recommended, regulatory domain United States):

2.4GHz (AP)
-NG-Mixed
-Wide HT40
-21dBm

5GHz (AP)
-AC/N-Mixed
-VHT80
-27dBm

Wireless Security (2.4 and 5)
WPA2 Personal
WPA2 Personal SHA256
CCMP-128 (AES)


Services:

-Additional Dnsmasq Options:
no-resolv
server=1.1.1.1 # cloudflare
server=1.0.0.1 # cloudflare
-Traff Daemon disable


Administration:

-Commands:
iptables -t mangle -I PREROUTING -m conntrack --ctstate INVALID -j DROP
iptables -t mangle -I PREROUTING -p tcp ! --syn -m conntrack --ctstate NEW -j DROP
iptables -t mangle -I PREROUTING -p tcp -m conntrack --ctstate NEW -m tcpmss ! --mss 536:65535 -j DROP
iptables -I INPUT -f -j DROP
iptables -I INPUT -p tcp --tcp-flags ALL ALL -j DROP
iptables -I INPUT -p tcp --tcp-flags ALL NONE -j DROP
iptables -I INPUT -s `nvram get lan_ipaddr`/`nvram get lan_netmask` -d `nvram get wan_ipaddr` -j DROP
iptables -I FORWARD -f -j DROP
iptables -I FORWARD -p tcp --dport 25 -j DROP
iptables -I FORWARD -p udp --dport 25 -j DROP
iptables -I FORWARD -p tcp -o `get_wanface` --dport 25 -j REJECT
iptables -I FORWARD -p tcp --dport 137 -j DROP
iptables -I FORWARD -p udp --dport 137 -j DROP
iptables -I FORWARD -p udp --dport 138 -j DROP
iptables -I FORWARD -p tcp --dport 139 -j DROP
iptables -I FORWARD -p udp --dport 139 -j DROP
iptables -I FORWARD -p tcp --dport 445 -j DROP
iptables -I FORWARD -p udp --dport 445 -j DROP
iptables -I FORWARD -p tcp --dport 31337 -j DROP
iptables -I FORWARD -p udp --dport 31337 -j DROP
iptables -I FORWARD -p tcp --tcp-flags ALL ALL -j DROP
iptables -I FORWARD -p tcp --tcp-flags ALL NONE -j DROP
iptables -A FORWARD -m recent --name portscan --rcheck --seconds 8640 -j DROP


Security:

SPI Firewall enable

ARP Spoofing Protection +

Block WAN Requests +
Block Anonymous WAN Requests (ping) +
Filter Multicast +
Filter WAN NAT Redirection +
Filter IDENT (Port 113) +

Impede WAN DoS/Bruteforce +
Limit SSH Access +
Limit Telnet Access +
Limit PPTP Server Access +
Limit FTP Server Access +


As you can see, pretty simple and basic setup. Hope this helps to figure out what's happening with 47xxx builds.
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 10656
Location: Texas, USA

PostPosted: Sat Oct 16, 2021 2:55    Post subject: Reply with quote
What are the default tx power settings for 2.4 and 5GHz radios on that device?
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herkow
DD-WRT Novice


Joined: 12 Apr 2013
Posts: 19

PostPosted: Sat Oct 16, 2021 3:28    Post subject: Reply with quote
I've made a factory reset and the defaults are 24dBm (max 24dBm) for 2.4GHz and 16dBm (max 30dBm) for 5GHz. My logic for using 21 and 27 is "half power". Im upgrading to last build right now and let default TX power, and I'll be back with the results.
herkow
DD-WRT Novice


Joined: 12 Apr 2013
Posts: 19

PostPosted: Sat Oct 16, 2021 3:59    Post subject: Reply with quote
Well, kernel-panic69 I owe you a beer or a cup of coffee. It's working perfectly with default TX power. All other settings are the same as posted before (I allways make a backup with every single update so I can switch builds quickly in case of issues). Now, the question is why the 47xxx doesn't work with 27dBm (it shows 30dBm as max next to the check box). I test the power with "WiFi Analizer" for Android. At 2m distance the results are:

2.4GHz: 1m -36dBm
5GHz: 0m -41dBm

I seriously doubt the accuracy of these apps, but it's all I have. So, I should go and edit my post on 47528...

I can't believe I didn't try lowering TX power... Thank you again kernel-panic69.
herkow
DD-WRT Novice


Joined: 12 Apr 2013
Posts: 19

PostPosted: Sat Oct 16, 2021 4:35    Post subject: Reply with quote
Bad news... The problem is back. It keeps dropping the connection even with default TX power... Back to edit the 47xxx post... And back to 46935. Something is actually broken on 47xxx.
Alozaros
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Joined: 16 Nov 2015
Posts: 4630
Location: UK, London, just across the river..

PostPosted: Sat Oct 16, 2021 6:53    Post subject: Reply with quote
herkow im very curious witch model is your unit Archer C7 ???
As the OP is asking for C7 v2, both C7 v2 and A7 v5 have a different hardware...radios, switch & SoC, so those settings of yours and problems may be addressed only for v5, unless you state the opposite and you have C7 v2 too Laughing Laughing

https://openwrt.org/toh/tp-link/archer_c7

_________________
Atheros
TP-Link WR740Nv1 ---DD-WRT 47528 BS AP,NAT
TP-Link WR1043NDv2 -DD-WRT 47528 BS AP,NAT,AP Isolation,Ad-Block,Firewall,Local DNS,Forced DNS,DoT,VPN,VLAN
TP-Link WR1043NDv2 -DD-WRT 47528 BS AP,NAT,Ad-Block,Firewall,Local DNS,Forced DNS,DoT,VPN,VLAN
TP-Link WR1043NDv2 -Gargoyle OS 1.13.0b AP,NAT,QoS,Quotas
Qualcomm Atheros/
Netgear R7800 --DD-WRT 47581 BS AP,NAT,AD-Block,AP&Net Isolation,VLAN's,Firewall,Local DNS,DoT,Vanilla
Netgear R9000 --DD-WRT 47581 BS AP,NAT,AD-Block,AP Isolation,Firewall,Local DNS,DoT,2,4Ghz only,Vanilla
Broadcom
Netgear R7000 ---DD-WRT 47581 BS AP,Wi-Fi OFF,NAT,AD-Block,Firewall,Local DNS,Forced DNS,VLAN's,DoT,VPN
------------------------------------------------------
Stubby for DNS over TLS I DNSCrypt v2 by mac913
herkow
DD-WRT Novice


Joined: 12 Apr 2013
Posts: 19

PostPosted: Sat Oct 16, 2021 7:25    Post subject: Reply with quote
My unit is a C7 V5 US. I know OP asked about V2 but as my post about build 46935 was mentioned I wanted to give as many details as possible to help solve the issues.
kernel-panic69
DD-WRT Guru


Joined: 08 May 2018
Posts: 10656
Location: Texas, USA

PostPosted: Sat Oct 16, 2021 11:26    Post subject: Reply with quote
@Alozaros: They all use the same drivers. There may be or may not be different default settings, but essentially what is under the hood on the firmware side is the same.
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gjbennett
DD-WRT Novice


Joined: 11 Apr 2020
Posts: 5

PostPosted: Sat Oct 16, 2021 15:10    Post subject: Reply with quote
Try changing the Wireless Network Mode to "Mixed" rather than "AC/N Mixed". My Archer C7 V2 has worked flawlessly on build 47481 after I made that change.

Other wireless and security settings are as above.
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