[elwood]

[LOM]

ok, so now make a startup script in the gui tab Administration->Commands

insmod usbnet
insmod cdc_ether
nvram set wan_ifname2=eth3
nvram commit

and save as Startup command.
You can actually omit the two nvram cmds, once set manually they will remain after a reboot.
You may have to do "nvram set wanifname2="
ie no name when you want to use the normal WAN port and not the dongle.

DHCP as WAN protocol in the gui should handle the interface up and pulling a dhcp address so you don't need the ifconfig up or the udhcpc manual cmds.

I assume that you got 192.168.32.1 as gateway for WAN and that the dhcp server in the dongle is set to start giving out addresses from .50
Try to open 192.168.32.1 from a computer browser, there may be a http server built into the dongle for configuration of user credentials and such things.

[elwood]

[elwood]

Found a small issue. If i unplug the dongle, when i plug it back in, it registers again with cdc_ether as well as assigns to eth3 but eth3 does not automatically come up or show up in ifconfig...

I manually loaded eth3 and everything was fine after. I did get some difference errors than the first time and not sure if it it's an issue or not...

[elwood]

I'm still at it! If I reboot the router or restart services I have to issue "ifconfig eth3 up & udhcpc -i eth3" with WAN set to DHCP within the GUI (this will not work if WAN is set to Disabled, Static will work as well with the correct info). After that, all devices on my network have connectivity automatically. I've tried placing the command to start eth3 in the startup script but it didn't work. I suspect that the module probably isn't loaded at the time it executes.

I can definitely live with having to manually start and assign an IP every time I reboot or restart services but I'm having a much more severe issue...

Some sites are very slow to load, sometimes you can hit X to stop loading then refresh and the website will instantly load. Sometimes it loads quick or slow and it seems to be completely loaded yet the "loading" icon continues to spin for minutes after.

This is happening on all computers and devices on my network, wired or wireless all browsers.

The connection is rock solid other than HTTP traffic. I've ran a ping all day long to a remote server and out of 8000+ packets only 1 was dropped.

I've tried clearing nvram, reflashing and completely starting over, disabled dnsmasq, packet sniffing, etc. etc. Watching packets in Wireshark, there are a ton of TCP connection reset's as well as a handful of other TCP issues.

I'm not sure where to go from here. Any advice on troubleshooting this issue? Should I try an earlier build?

[bdonkey]

Glad to see someone else trying to use their UML295 with DD-WRT!

I've been having the same problems, webpages loading halfway / spinning, etc. Most recently, I thought it might be an MTU issue, and set my MTU to 1428 (LTE), but it didn't solve the problem. Didn't run a packet sniffer like you did, though, I'll take a look to see if they really are TCP resets.

As a workaround, I've been running the UML295 connected to OpenWRT (on an RT-N13U B1), which isn't doing much, just bridging the UML295 eth interface to its WAN port, which is then connected to the DD-WRT router's WAN port (WZR-1750DHP). This solution has been rock solid for the last year.

Over the past few months, I've been trying on and off to eliminate the OpenWRT router and connect the UML295 directly to the DD-WRT router, but have always run into the same problem you're having, and am no closer to a solution. :/

In any case, hope we can put our heads together and figure this out. I'm still at it as well!

[elwood]

[bdonkey]

I'm thinking it might be an issue in the USB networking stack on DD-WRT. On OpenWRT it works fine, it uses the same kernel modules, and as far as I can tell, OpenWRT is not aware it's a "modem" and is not doing any modem-specific stuff.

I am doubtful there is any "modem" specific stuff causing these issues because these devices just show up as a standard USB Ethernet device in any OS. (While there may be a separate usb diag interface in case you install the vendor-specific software to enable things like IP pass-through like on the Cradlepoint or on Windows, it's certainly not necessary).

Some other similar modems may require the use of usb-modeswitch to take them out of their "emulate a driver CDROM" mode and put them into the USB networking mode, but the UML295 is working fine for me without usb-modeswitch or installing any vendor-specific OS drivers across multiple systems.

As an experiment, I switched to using a 5510L on the OpenWRT router, and it appears to be working fine. I'll try the 5510L via USB on DD-WRT and see if it has the same issues as the UML295 on DD-WRT. If the problem recurs, this would rule out the problem being specific to the UML295 or to Pantech.

Another thing someone could try is switching out the UML295 for a regular USB-Ethernet adapter and seeing if it works fine on DD-WRT or shows the same issues. If the problems recur, this would help in definitely ruling out the problem being related to any modem-specific stuff. (Unfortunately, I don't think any of the USB adapters I have on hand use the cdc_ether / rndis driver, they're either ASIX or SMSC.)

[bdonkey]

Tried it with my 5510L, seem to be running into the same issue. For example, I'm getting TCP RST during sessions with CDNs like EdgeCast and MaxCDN, which is in line with the symptoms I'm seeing (images on some pages not loading, due to them being hosted on the affected CDNs).

[LOM]

[elwood]

[bdonkey]

From OpenWRT for comparison, looks to be same/similar:

[bdonkey]

Elwood, have you tried changing any TCP MSS clamping settings from that microtik thread you linked? I'm wondering if TCP-to-PMTU clamping is only happening on vlan2 by default, and not when we change the WAN port to eth3?

[elwood]

[bdonkey]