Mods To My Cisco Linksys E4200 v1: My Ongoing Notes

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DD-WRT Novice

Joined: 02 Dec 2007
Posts: 16

PostPosted: Fri Jun 21, 2013 16:24    Post subject: Mods To My Cisco Linksys E4200 v1: My Ongoing Notes Reply with quote
If the mods don't object, I would like to dedicate this thread as a sort of "my notes" repository for the various mods and tests I perform to my Cisco Linksys E4200 v1. That way others (newbs, or not) can learn from my trials and tribulations. If this is a problem please just lock the thread now and I will understand.
DD-WRT Novice

Joined: 02 Dec 2007
Posts: 16

PostPosted: Fri Jun 21, 2013 16:46    Post subject: Reply with quote
Purchased this Linksys E4200 used. MIS ID 1911.

Rcvd router from purchase.
It was personalized so reset it by pressing the Reset button for 10 sec.

Default IPA:
Default UN: admin
Default PWD: admin

Device Firmware Version: 1.0.01 (stock FW)

Followed DDRWRT WIKI ( )
and performed initial upgrade of firmware to DDWRT ( dd-wrt.v24-18777_NEWD-2_K2.6_mini-e4200.bin) .

Successful. Tweaked settings.

Running as EE unregulated internet access WIFI so that users can pound on it for a few weeks.

Performed TTL Mod due to some internet providors changing their TTL to 1 thus not allowing packets to forward through your router (and the packets simply die in the router):
Set the incoming TTL to 10, before the router routes it into the LAN:
iptables -t mangle -I PREROUTING -i `get_wanface` -j TTL --ttl-set 10

Set the outgoing TTL to 128, just as if a Windows machine was connected directly to the modem.:
iptables -t mangle -I POSTROUTING -o `get_wanface` -j TTL --ttl-set 128

Running both of these.
"Save Firewall" so that it will persist through a reboot of the router.

1:25pm> Noticed router dropped LAN connections, and it came back after a minute or two.
The DDWRT WIKI recommends:
"Both the 2.4 and 5GHz Radios run at a stock transmitting power of 100mW, decreasing the transmitting power to a value between 40 & 50mW has seemed to help stability. "

But I am not going to adjust that yet.

3:54pm> Found that my connection had dropped within the last 54 minutes. Reduced both WL0 and WL1 from 100 to 50mw TX power.

3:17pm> WL1 (N radio) seems to be stable at 50mw. Increasing both N and G radios to 75mw and to observe.

(has been stable)

Consulting with others in the DDWRT community about what versions work well on this router.

75mw Radio setting has been stable.
Would like to flash to a mega build to explore the additional features.
Performed 30/30/30
Shot from the hip and picked "dd-wrt.v24-21402_NEWD-2_K2.6_mega-nv60k.bin" to try. Flashed it.
Waited a few minutes.
Performed 30/30/30.
Configured Settings specific to our network:
IP, username / pwd, WIFI name, WL0: BG Mixed Channel 5, WL1 N-Only 5GHZ, WIFI sec: WPA2 Personal AES (for both), TX power 75mw (for both).
TTL mod (outlined above).

Power-cycled. Backed up config (nvram).
Back in production with 20-25 WIFI user devices such as laptops, iPhones, iPads, android phones, including my laptop with VPN client connected back to company network through this router.
DD-WRT Novice

Joined: 02 Dec 2007
Posts: 16

PostPosted: Thu Jun 27, 2013 20:24    Post subject: Reply with quote
Checked reach of both radios. N radio seems to have less reach than yesterday.
Changed TX power for both radios from 75mw to 100mw.
This seemed to make no difference as far as reach.

This device continues to serve many devices. Very solid device and DDWRT build.
Multiple concurrent IPSEC VPN passthrough sessions have worked fine, along with the other 20-25 WIFI devices accessing it.
It has been rebooted only during power outages. The longest period that it has been on is probably 3 days so far.
I'm purchasing a second E4200 v1!
DD-WRT Novice

Joined: 05 Jun 2008
Posts: 8

PostPosted: Mon Jul 01, 2013 23:19    Post subject: Reply with quote
thank you for this post. I love seeing people do test so I can copy it and test it..

Joined: 29 Nov 2009
Posts: 354
Location: Dark Side of the Moon

PostPosted: Sun Jul 14, 2013 13:00    Post subject: Just wondering if you are still testing. Reply with quote
I have the same router and have tried many different configurations on it. I was just wondering if you were still testing or if you called it quits. One thing though the router seems to perform better with a low tx power rather than raising it as high as it will take. Got this off another thread and seems to be the case.
E4200 w/ mega build 23838

4 wrt160n v3 w/ BrainSlayer dd-wrt.v24-15778_NEWD-2_K2.6_std_nokaid_small.bin

2 wrt320n w/ BrainSlayer dd-wrt v24-15778 NEWD-2_K2.6_big.bin

wndr3300 w/ dd-wrt.v24-14583_NEWD_std-nokaid_nohotspot_nostor.bin

wrt54g v6 w/ Brainslayer 14594 dd-wrt.v24_micro_generic.bin

wrt400n w/ 21676 build

Peacock Thread | BrainSlayer Builds | Eko Builds
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