Does it work for 3g dongles

[drsound]

At current state, it works with any kind of uplink (DSL, 3G, Wi-Fi, fiber) if you can provide:

• an interface name (ex. eth0, wlan0, etc.)
• a static IP address to be assigned to this interface
• a gateway IP address

I've never used 3G dongles on Linux, so I'm not sure how interfaces are configured. I suppose they assign a public dynamic IP address to a dongle0 (?) interface. Fault tolerant router should work with it with minor modifications. Just send me the output of these commands so that I can be more precise:

• ip addr
• ip route

[saikumar25]

Hey thanks a lot for the swift reply , yes the 3G dongles have a public dynamic IP address . By the way , the output for ip addr is :- 1: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 3 link/ppp inet 100.104.204.166 peer 10.64.64.64/32 scope global ppp0 2: ppp1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast qlen 3 link/ppp inet 100.103.92.112 peer 10.64.64.65/32 scope global ppp1

ip route is :- 10.64.64.65 dev ppp1 proto kernel scope link src 100.103.92.112 10.64.64.64 dev ppp0 proto kernel scope link src 100.104.204.166 default via 10.64.64.64 dev ppp0

[drsound]

Ok, Fault Tolerant Router has has just one problem with your configuration: the fact your IP addresses are dynamic. But you may overcome this, follow me.

Let's start with a simple case, let's suppose 10.64.64.65, 10.64.64.64, 100.103.92.112 and 100.104.204.166 were static IP addresses. You should:

• Delete the default route with ip route del default, as Fault Tolerant Router wants to set its own. Better yet, make so that the 3G dongle doesn't set a default route at all (don't know how its startup script works).
• Configure 2 uplinks in /etc/fault_tolerant_router.conf:
  • First dongle:
  • interface: ppp0
  • ip: 100.104.204.166
  • gateway: 10.64.64.64
  • Second dongle:
  • interface: ppp1
  • ip: 100.103.92.112
  • gateway: 10.64.64.65

This would work, and you can actually try it, until your dynamic IP addresses don't change. I see two possible solutions:

• You should find some way to detect when the dynamic IP change: when it happens, rewrite /etc/fault_tolerant_router.conf with the new IP addresses and restart Fault Tolerant Router.
• Fault Tolerant Router should care about it: it needs a new configuration option to mark an uplink as a dynamic IP one, then automatically detect IP and gateway on startup (easy on PPP links). Finally, when one of these "dynamic IP" uplinks seems to be down, before really marking it as "down" should try to see if the IP address changed.

Of course, if you want to have a working solution in a short time, I advise you to go with the first solution. Anyway I will open an enhancment issue for the second one.

[saikumar25]

I tried what you have said and deleted the default route , and tried pinging , it says network unreachable . So , I have thought to first try implementing fault_tolerant_router with static ip addresses taking two WAN(Ethernet) interfaces . These are the steps I followed after connecting the linux router (CentOS) with two WAN uplinks :-

• I ran fault_tolerant_config generate_config , then I edited the /etc/fault_tolerant_router.conf accordingly
• Then I ran fault_tolerant_router generate_iptables

And then ran the fault_tolerant_router monitor , I get one error saying :- RTNETLINK ANSWERS : Numerical result of range , and the daemon keeps running .

I am a rookie and I do not understand the underlying code very deeply , so correct me if I am wrong . According to this website :- http://lartc.org/howto/lartc.rpdb.multiple-links.html -- Does fault_tolerant_router run iptables command ,if so there should be multiple table for each WAN interface, right ? and

• ip route show table main - should show an output like

192.168.2.0/24 dev eth0 proto kernel scope link src 192.168.2.3 10.0.0.0/8 dev eth2 proto kernel scope link src 10.10.1.76 default nexthop via 10.10.1.1 dev eth2 weight 1 nexthop via 192.168.2.1 dev eth0 weight 1

(I DO NOT get this output when I run fault_tolerant_monitor , Could you please spoon feed me If you have time , to get this up ,from what I have read and understood fault_tolerant_router should provide load_balancing with WAN failover right ?, I guess If I could this working in this environment , I could get it working in the 3G Dongles environment as well , I could run a script which would edit the dynamically changing ip addresses and edit the configuration file accordingly ) .

Can I add , these commands in the generate_iptables.rb for splitting access and getting load-balancing :-

    *  ip route add 10.10.1.0/8 dev eth2 src 10.10.1.76 table T1
*  ip route add default via 10.10.1.1 table T1
* ip route add 192.168.2.0/24 dev eth0 src 192.168.2.3  table T2
* ip route add default via 192.168.2.1 table T2

These will add entries in main routing table :-

    * ip route add 10.10.1.0/8 dev 10.10.1.76
* ip route add 192.168.2.0/24 dev 192.168.2.3

Creating rules :- * ip rule add from 10.10.1.76 table T1 * ip rule add from 192.168.2.3 table T2

Then doing load-balancing through :- * ip route add default scope global nexthop via 10.10.1.1 dev eth0 weight 1 nexthop via 192.168.2.1 dev eth2 weight 1

[drsound]

PPP dynamic IP support is now in development branch, some testing is appreciated.

[drsound]

PPP dynamic IP support is now in master branch and a new gem (v1.1.0) is out. Please test is possible, because I have no real PPP uplink, so I could't do it extensively.