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Changing OS if behind another router

Discussion in 'Other Linksys Equipment' started by dtgorm, Jul 8, 2006.

  1. dtgorm

    dtgorm Network Guru Member

    Ok, I have a BEFSX41 's WAN port hooked to a LAN port on a WRT54G.

    What I'm wondering about is, in order to even access the BEFSX41's web admin page, does the pc have to be hooked directly to the LAN port of the BEFSX41?

    I'd like to play around with maybe changing the OS if possible on the BEFSX41 but not loose my ip on my pc.

  2. DocLarge

    DocLarge Super Moderator Staff Member Member

    No, you don't have to be plugged into the BEFSX41.

    If the BEFSX41 is at the default setting of "automatic - dhcp" then it will get it's "WAN" ip address from your WRT54G (if the WRT54G's dhcp server is on).

    Let's say the BEFSX41's "WAN" port pulled ip address from the WRT54G, it's local "LAN" ip address is, and you set its (BEFSX41) remote access port to 8080 (make sure you turn the BEFSX41's firewall off to avoid double NAT'ing). To access it from the WRT54G, connect CAT5 to one of the WRT54G's opnen LAN ports, open your web browser and type in the following:

    In order to access the BEFSX41, its WAN port needs to be on the same subnet as the WRT54G; now that it is, you can access by going through it's WAN port, thus allowing you access to it's (BEFSX41) local "LAN" ip. You now have two routable subnets. If you wanted to make the BEFSX41's subnet wireless, just attach an access point or a spare router to one of its (BEFSX41) ports and give it an ip address on the BEFSX41's subnet (such as If you use a spare router, run CAT5 from the one of the BEFSX41's open LAN ports to an open LAN port on the router.

    If you flash the firmware on the router, you're going to lose your ip; however, if you're getting your ip from the default setting of the BEFSX41's dhcp server range, then you'll get another IP as soon as you set the router back to default settings after flashing it with the new firmware


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