Michael, Yes, testing will be the key...
Recent versions of AstLinux (1.1.2+) ifplugd is used to monitor the link state of the external EXTIF and EXT2IF when configured to use DHCP-cleint and retry DHCP on a state "up" change. So in theory, connecting the EXT2IF with EXT2IP="" will pull a lease from upstream and set the default route. Since AstLinux's EXTIF previously had a public IP address, Asterisk SIP is running without NAT to the public, so adding a NAT to EXT2IF would probably cause issues on the switchover. If like you suggested your 4G/LTE "router" could serve DHCP for it's "public" IP address as a bridge that would be perfect. Another trick is on your 4G/LTE "router", configure a fixed private address assigned via DHCP to AstLinux and set it as a "DMZ" IP address so it won't be NAT'ed. Though, unfortunately here in the US, many LTE providers are using NAT as a part of their infrastructure for IPv4, but fortunately are also offering IPv6. Please share your results. Lonnie On Jun 17, 2014, at 12:20 AM, Michael Knill wrote: > Thanks Lonnie > > I just realised that i may be making this more complicated than it really is. > I understand now that most 3G/4G carriers here actually use straight DHCP on > a private address which is NAT’d to the Public Internet. Theoretically then I > should just be able to implement EXT2IP=“” with the 4G router in Bridge Mode > and change the default route. Do you know how this would work as far as > routing is concerned. I assume that DHCP on EXT2IP would pull in an EXT2GW, > writing a default route. Which one would take precedence? > > I think I will need to do some testing. > > Regards > Michael Knill > > > > > On 17 Jun 2014, at 1:54 pm, Lonnie Abelbeck <li...@lonnie.abelbeck.com> wrote: > >> Hi Michael, >> >> Good questions... >> >> First, EXT2IF works with either static or DHCP to set the IP address. >> EXT2IP="" uses DHCP. No direct web interface support, so it must be defined >> in user.conf Network -> "Advanced Configuration" area. If EXT2IF is defined >> it is automatically added as an external interface for the firewall, though >> the default route would have to change to utilize it. >> >> Keep in mind that using EXT2IF is somewhat uncommon (I presume) for our >> users, but that would be the proper way to add a parallel failover. >> >> I have wrestled with the idea for a failover for my home/office >> connection... I have a DOCSIS 3 cable modem and the only other alternative >> is DSL (PPPoE) or LTE wireless, the added costs for true failover did not >> make economic sense for me, so I pay more of Business Internet Service (Cox >> Communications) using DOCSIS 3 which includes a SLA. I have not regretted >> that decision. >> >> As an alternative for a failover, years ago I purchased a little >> WiFi-client, Netgear WNCE2001 N300 >> http://www.amazon.com/NETGEAR-Universal-Ethernet-Adapter-WNCE2001/dp/B003KPBRRW/ >> >> This little device acts as an ethernet to WiFi-client bridge, so together >> with a 4G wireless LTE MiFi or tethered device with WiFi you could simply >> replace the EXTIF with the Netgear N300/LTE pair and temporarily >> re-establish the connection, assuming the previous connection was DHCP and >> not counting on static IP addresses. Regardless, Asterisk my require a >> reload to cope with the changed IP path. Best to have the WiFi-client >> bridge pre-configured so it is immediately available when needed. >> >> Here in the US, LTE is very expensive for bandwidth, around $10 per 1 GB of >> data, so without monitoring this could be very expensive as a broadband >> replacement. >> >> Personally with an iPad with LTE, if the primary internet should go down I >> still have a good backup, and can even enable WiFi tethering to my MacBook >> if I wish. As such, my iPad w/LTE is my failover plan. >> >> Lonnie >> >> >> >> On Jun 16, 2014, at 9:42 PM, Michael Knill wrote: >> >>> Hi group >>> >>> I am looking at setting up a backup 4G/LTE connection for a customer (and >>> provide it as a product offering) and just wondering the best way to >>> provide it in Astlinux. >>> The 4G router can support bridge mode so ideally I would like to have dual >>> PPPoE connections but I don’t think this is easily done in Astlinux? I am >>> happy (and would prefer) to manually switch the routing over to a backup >>> connection. >>> >>> Currently Astlinux’s EXT2IF requires a static address which would mean >>> double NAT for me (I assume) as I would need to route rather than bridge on >>> both firewall external interfaces. Should this be a problem? Could I >>> disable NAT but do IP Tables on Astlinux and do NAT on a router? If I have >>> a good enough router (who can you trust?), I could just turn off the >>> Astlinux firewall and make it a telephony server and router only? >>> >>> I was thinking that worst case, I could put the 4G router on the DMZ or >>> internal network and just change the default route on Astlinux to point to >>> it on failover. >>> >>> Any ideas? >>> >>> Regards >>> Michael Knill >> >> >> >> >> ------------------------------------------------------------------------------ >> HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions >> Find What Matters Most in Your Big Data with HPCC Systems >> Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. >> Leverages Graph Analysis for Fast Processing & Easy Data Exploration >> http://p.sf.net/sfu/hpccsystems >> _______________________________________________ >> Astlinux-users mailing list >> Astlinux-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/astlinux-users >> >> Donations to support AstLinux are graciously accepted via PayPal to >> pay...@krisk.org. > > > ------------------------------------------------------------------------------ > HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions > Find What Matters Most in Your Big Data with HPCC Systems > Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. > Leverages Graph Analysis for Fast Processing & Easy Data Exploration > http://p.sf.net/sfu/hpccsystems > _______________________________________________ > Astlinux-users mailing list > Astlinux-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/astlinux-users > > Donations to support AstLinux are graciously accepted via PayPal to > pay...@krisk.org. > > ------------------------------------------------------------------------------ HPCC Systems Open Source Big Data Platform from LexisNexis Risk Solutions Find What Matters Most in Your Big Data with HPCC Systems Open Source. Fast. Scalable. Simple. Ideal for Dirty Data. Leverages Graph Analysis for Fast Processing & Easy Data Exploration http://p.sf.net/sfu/hpccsystems _______________________________________________ Astlinux-users mailing list Astlinux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/astlinux-users Donations to support AstLinux are graciously accepted via PayPal to pay...@krisk.org.
