Transparent bridge ADSL modem
Hi all, I am looking for a reliable, good quality ADSL device that can be used as a transparent bridge to a Linux machine. Some of the Linux machines we have run as IPSEC heads, and by far the best way to make sure that the device correctly forwards packets on certain protocols (not ports) would be to have it transparent. Ultimately what I want to have is this: internet -- adsl modem -- [linux (eth1: public IP) ] [linux (eth0: internal IP)] - nat The closest I've got to this before is the M1122 on PPTP, but I would rather the bridge was at ethernet level if possible. Can anyone make any recommendations on devices that do this? Reliability is far more important than price (these will be for business customers) and I would prefer something that has firmware upgrades available without a support contract. Thanks, Craig
I am looking for a reliable, good quality ADSL device that can be used as a transparent bridge to a Linux machine.
Can anyone make any recommendations on devices that do this? Reliability is far more important than price (these will be for business customers) and I would prefer something that has firmware upgrades available without a support contract.
I use a D-Link 302G at home, the one that Telecom supplies with their Home Customers Jetstream Starter Pack thing. If you have the Modem to the NAT then it's bloody awful, but if you upgrade the firmware to the one posted on the dlink.com.au site, and then just disable NAT on the modem web-interface (annoyingly you _have_ to use Internet Explorer to do this, Firefox wont do it at all) it turns into a transparent proxy, and will give the external IP to the Linux box through DHCP. I.e. with NAT disabled it behaves almost exactly like a Cable modem. And yes the firmware is freely available off of the dlink.com.au website, but you have to change some setting from its default so it will I haven't had any troubles with this so far, and it's been working a lot better than with the modem doing the NAT, but I've also only been running it like this for about 2 weeks or so... More details on this process are on the WLUG site : http://www.wlug.org.nz/DSL-302G Scroll down to near the bottom, where it talks about "half-bridge mode".
And yes the firmware is freely available off of the dlink.com.au website, but you have to change some setting from its default so it will
Oops... I forgot to finish my sentence... And yes the firmware is freely available off of the dlink.com.au website, but you have to change some setting from its default so it will work on NZ DSL network.
Quoting Camster342 <camster342(a)gmail.com>:
I use a D-Link 302G at home, the one that Telecom supplies with their Home Customers Jetstream Starter Pack thing. If you have the Modem to the NAT then it's bloody awful, but if you upgrade the firmware to the one posted on the dlink.com.au site
It sounds like you've done this before. Do you have-a/know-of guide? Unfortunately I've got one of these god aweful modems... and would like to know how to "fix" it. Cheers, James.
jamesc(a)bofh.co.nz wrote:
Quoting Camster342 <camster342(a)gmail.com>:
I use a D-Link 302G at home, the one that Telecom supplies with their Home Customers Jetstream Starter Pack thing. If you have the Modem to the NAT then it's bloody awful, but if you upgrade the firmware to the one posted on the dlink.com.au site
It sounds like you've done this before. Do you have-a/know-of guide? Unfortunately I've got one of these god aweful modems... and would like to know how to "fix" it.
More details on this process are on the WLUG site : http://www.wlug.org.nz/DSL-302G Scroll down to near the bottom, where it talks about "half-bridge mode". :) Craig
It sounds like you've done this before. Do you have-a/know-of guide? Unfortunately I've got one of these god aweful modems... and would like to know how to "fix" it.
More details on this process are on the WLUG site : http://www.wlug.org.nz/DSL-302G Scroll down to near the bottom, where it talks about "half-bridge mode".
I have done this before, and there is a guide on the WLUG site, but if you have more questions or want more help with making a linux box do the NAT instead of the modem, just ask away.
More details on this process are on the WLUG site : http://www.wlug.org.nz/DSL-302G Scroll down to near the bottom, where it talks about "half-bridge mode".
Wow, I stand corrected - obviously there are other modems out there that can do it. BTW - you the HOW-TO mentions problems obtaining a second DHCP lease from the modem (even for the same MAC address) - I'm wondering if setting the linux box to use a static IP (assuming your DSL IP is static) would get around that problem... Regards, Pete
Hi Pete, On the 302G with the newer aussie spec firmwares this problem does not exist (using dhcpcd anyway), the modem also requires that you acquire a lease, rather than setting the IP statically as this is what it uses to establish the half-bridge. I am using the DSL-302G in Australia and New Zealand at around 8 business sites and running OpenVPN tunnels over it with success. The best place to get info on these modems is on the bigpond forums in Oz as they were the modem Telstra shipped with new connections. Regards, Andrew Pete wrote:
More details on this process are on the WLUG site : http://www.wlug.org.nz/DSL-302G Scroll down to near the bottom, where it talks about "half-bridge mode".
Wow, I stand corrected - obviously there are other modems out there that can do it.
BTW - you the HOW-TO mentions problems obtaining a second DHCP lease from the modem (even for the same MAC address) - I'm wondering if setting the linux box to use a static IP (assuming your DSL IP is static) would get around that problem...
Regards, Pete
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On 24/08/05, Pete <speed(a)advcomm.co.nz> wrote:
More details on this process are on the WLUG site : http://www.wlug.org.nz/DSL-302G Scroll down to near the bottom, where it talks about "half-bridge mode".
Wow, I stand corrected - obviously there are other modems out there that can do it.
BTW - you the HOW-TO mentions problems obtaining a second DHCP lease from the modem (even for the same MAC address) - I'm wondering if setting the linux box to use a static IP (assuming your DSL IP is static) would get around that problem...
On my linux box at home I have it using DHCP to get the IP from the modem, (from what my syslog says, it renews the lease every 52 seconds or so!), and I have had to reboot the linux box a few (4 or 5) times now and haven't had to reboot the modem yet. I've had over 3 weeks of usage like this now. The problem specified on the wlug page may have been a result of a slightly older firmware, or perhaps a different DHCP configuration on his linux box. Like it says on the page though... YMMV.
participants (6)
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Andrew Thrift -
Camster342 -
Craig Box -
Craig Box -
jamesc＠bofh.co.nz -
Pete