Linux ppp0 default route

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. I'm replacing a pfSense router in a remote office with a small linux device, running Debian. I'm using a combination of radvdwide-dhcpv6-clientwide-dhcpv6-server and ppp to configure the addressing. Pretty much everything works, except for the fact that the router doesn't receive a default IPv6 route when the ppp0 comes up.

Clients can ping the router, but the router can't ping the outside world. I've configured wide-dhcpv6-client like this eth0 is the local LAN adapter :.

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The upstream provided DNS servers are populated correctly in resolv. However, ip -6 show route doesn't have any gateway listed:. However, my expectation is that when the ppp0 interface comes up, the route should be autoconfigured, along with the prefix, DNS servers and everything else. IPv6 routing works on pfSense 2.

Do I need to manually add this route each time ppp0 comes up, or should this automatically work? I've got a debian Linux box doing almost the same thing I don't use a dhcpv6 server and I'm using dibbler as the ipv6 dhcp client for the ppp interfacein my PPP config I've got:.

I suspect you're missing the defaultroute option. To ensure that kernel config params are really set everytime the ppp device comes up try to use a udev rule:. Could you capture interface ppp trace with tcpdump during ppp negotiation so you can see if ipv6 adress is being provided by RAS?

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The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.Once your PPTP tunnel connects, you need to make sure you can reach hosts on the other side of the tunnel. If you only wish communication to work between the PPTP connected hosts server and clientit's easy. Both sides of the tunnel have an IP and you should be able to reach the other side when you are connected.

Slightly more advanced is if you have one computer connected to a server and want to reach computers on the server's LAN. If this is the case, you will have to set up a route to the other network after the tunnel starts. In the figure above: the tunnel from the client to the server is ppp0, the remote network uses addresses starting with So after the tunnel starts, add this route: route add -net Packets addressed to the tunnel server itself will still use the interface route created when the tunnel started.

If you have other computers connected to your computer, in a local area netowork LANyou may want them to be able to connect to the remote network. Like this:. If you wish to reach any computer on the other side of the tunnel, from any computer on your LAN, you will also need to set up a routing on the foreign LAN, or use ipchains or iptable to do address translation.

In the figure above, the important information is: the remote network is The solution depends on the kernel version. This is a special case when you are running a workplace tunnel within an ADSL service provider's tunnel.

linux ppp0 default route

Also, the file should be executable! Some sites configure their PPTP server to give to the server end of tunnel the same IP address that is used to contact the public interface of the server.

When this happens, it isn't practical to use simple routing. In the figure above: the link from the client to the internet is ppp0, and has an IP address at the client of PPTP Client.

Client to Server If you only wish communication to work between the PPTP connected hosts server and clientit's easy. For example: ifconfig ppp0 grep inet inet addr The remainder of this section covers alternate methods. Replaced primary interface name in ip-up. Reported by Jeff Nelson.In this article I show you how to configure PPP for the most common type of connection.

We assume your Linux machine is a stand-alone machine that dials into an Internet Service Provider and performs an automatic login, and the Internet Service Provider allocates the IP address that your machine will use. You will need the right software and a couple of pieces of information before you start.

Let's get started. First, check that you have the right software. The program that manages PPP for Linux is called pppd. The pppd program is linked very tightly with the kernel, so you must run a version of pppd that matches your kernel. If the first command fails, you probably don't have PPP installed. You can obtain the latest version of the source from:.

If you have installed from a distribution such as Debian, Red Hat or Slackware, the pppd program is available precompiled within those distributions. You just have to get the package and install it. Next you must note what keystrokes you will send and what prompts you will receive to log in to your ISP. The best way to collect these is to try manually logging into your ISP using a terminal program such as minicom.

Lastly, you must know the IP address of a nameserver so that you can configure your name resolver and use host names instead of IP addresses. Get this information from your ISP.

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The pppd program can accept configuration parameters from two places. The arguments supplied are close to identical in either case, but the command line method can be messy. So I will describe how to configure PPP using the options files instead. The options file is a simple text file containing parameters pppd will use when it is executed—one parameter per line. The options file must be readable by whoever will execute the pppd program. In most installations this will be root, either directly or by executing pppd from a program like sudo.

These are all fairly typical defaults for an ISP connection. You will have to adjust the serial device to suit where you have your modem connected and, if you are using data compression, you might want to set your serial port speed to something higher.

PPP provides a means of escaping select characters, so that they do not interfere with your connection. For example, if you were running PPP over a link that would disconnect if it received a control-D character, you could ask PPP to escape that character, and it would automatically replace it with another and reverse the process at the other end.

linux ppp0 default route

While the default is safe, it escapes a number of characters that normally don't need escaping and this will decrease the performance of your link.

Since most ISPs provide 8 bit clean links you don't need to escape any characters, so we tell pppd not to, using the asyncmap option.

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The pppd package includes a program called chat. The chat program is a simple program that can be used to automate the dialing procedure.

The chat program also accepts arguments from the command line or from a file. Again I'll describe how to configure it from a file as this is the better method. To make use of the chat program from within pppd, we must ensure that the connect option points to a script that calls chat.

This shell script will invoke the chat command with the -v-t and -f arguments. The -v argument is useful when you are configuring pppd, as it sends verbose diagnostic messages to the system log to show you what is happening as the chat program runs. The -t 60 argument simply tells the chat program to wait 60 seconds for the expected text to arrive before timing out with an error.

Make sure the script is readable and executable by whoever will invoke pppd.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Ask Ubuntu is a question and answer site for Ubuntu users and developers. It only takes a minute to sign up. I'm trying to add a default route on my ppp0 connection, I want the default route points to that connection.

I would like to know where is the right place to accomplish this. The IP address is the one of your default gateway and the last entry is the device name of your device. Already long time ago, but none of the above described solutions worked for me.

The script is picked up automatically after the pptp connection was created. It works like a charm. Then click on routes and add your route there eg network Your default route for your primary interface? This should be done by default if you're using DHCP. Assuming your interface is eth0 and network is Now if you want a static route that is NOT your default route, that is different.

Ubuntu Community Ask! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Asked 9 years, 8 months ago. Active 7 years, 10 months ago. Viewed 37k times.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am using Debian Linux and using wvdial, I am able to establish ppp connection with the cellular network.

How do I find out the default gateway for the PPP interface? First of all, you can grab it from the interface info using ip assuming your ppp interface is ppp0 :. Second, when it's ppp, you can always choose "default device routing" over "default gw routing". In this case you could add the ppp0 device as your default device regardless of the gw address, using ip:.

Learn more. How to find the default gateway of PPP interface? Ask Question. Asked 8 years, 5 months ago. Active 6 years, 4 months ago.

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Viewed 11k times. Ravi Ravi 3 3 gold badges 9 9 silver badges 20 20 bronze badges. Active Oldest Votes. PPP is a point-to-point protocol.

You are one point.

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The other point is the default route. David Schwartz David Schwartz k 16 16 gold badges silver badges bronze badges. It might be helpful to check kernel IP routing table to find default gateway with: netstat -rn.

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linux ppp0 default route

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Server Fault is a question and answer site for system and network administrators. It only takes a minute to sign up. This turns out to be harder than I thought.

The routes I want to delete are the "! I have two entries for These are auto-generated by the little Linux based router I'm using. H" route for reasons I simply don't understand. The types of the routes with the! Use iproute2.

How to Find Default Gateway in Linux

The net-tools way to delete these routes would be to use route del on it. However, net-tools provides no way to differentiate between the rejected route and the other one because the dev argument is optional, though not specifying a device is likely to remove the unreachable route. It might not be unreachable, but prohibit. Use ip route with no arguments to determine which. But, I think you've got something else goofy going on since you have 2 default routes.

Really, it was eht0 and not eth0 there! Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. How do I delete a route from Linux routing table Ask Question.

Asked 9 years, 7 months ago. Active 7 months ago. Viewed k times. Here is the routing table Zoredache k 32 32 gold badges silver badges bronze badges. Can you be more specific when you say traffic takes the 'second route'?

linux ppp0 default route

Notice the two table entries for During these challenging times, we guarantee we will work tirelessly to support you. We will continue to give you accurate and timely information throughout the crisis, and we will deliver on our mission — to help everyone in the world learn how to do anything — no matter what. Thank you to our community and to all of our readers who are working to aid others in this time of crisis, and to all of those who are making personal sacrifices for the good of their communities.

We will get through this together. Updated: April 2, References. Your default gateway is the IP address of your router. Typically this is automatically detected by your operating system during installation, but you may need to change it.

This is especially true if you have multiple network adapters or routers on the network. Open a terminal window. Type "sudo route delete default gw IP Adapter " and press Enter. Type "sudo route add default gw IP Adapter " and press Enter. Update the gateway IP address for the adapter. Save your changes and exit the editor. Did this summary help you? Yes No. Log in Facebook Loading Google Loading Civic Loading No account yet? Create an account. We use cookies to make wikiHow great.

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Learn more Explore this Article Using the Terminal. Editing Your Configuration File. Related Articles. Article Summary. Part 1 of Open the Terminal. View your current default gateway. The address next to "default" shows your default gateway, and the interface it is assigned to is displayed on the right side of the table. Delete your current default gateway. If you have more than one default gateway set, you'll run into connection conflicts.

Delete your existing default gateway if you intend to change it.


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