Questions tagged [point-to-point-protocol]

Point-to-Point Protocol

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Howto prevent udevd wrongly enqueues remove event for device ppp?

Connecting a PDA device with Debian using SynCE, USB serial device is recognized and connects with ttyUSB bus, obtains an IP address and disconnects after a few seconds (two, max three). This is how ...
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22 views

Lost of PPP Connection between Debian <--> PDA / HandHeld using SynCE

I am currently able to connect a handheld to the PC running Linux with a very old Ubuntu 14.04, adding repository PPA for SynCE to source list. Now, the goal is to update the operating system, I chose ...
1 vote
1 answer
2k views

Connection failed using L2TP on Ubuntu 20

I am trying to establish a VPN connection but I am unable to do so. The issues points to PPP as can be seen in the log output below. However, I am not quite sure what I can make out of this: /var/log/...
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Is it possible to use a ppp connection rather than a veth to connect docker and host?

I know a veth pair can be created to used communicate between docker container and host: ip link add veth0 type veth peer name veth1 netns test But I just want to known if there a simple way to make ...
1 vote
0 answers
327 views

routing ppp <-> wireguard interfaces

I want to connect via wireguard to a droplet that will be running openfortivpn for connecting to a 192.168.11.0/24 network. I have confirmed that only traffic to 192.168.11.* goes through fortivpn and ...
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What `LCP TermReq` after `IPCP ConfReq id=0x2 <addr 0.0.0.0> <ms-dns1 0.0.0.0>...` means?

What LCP TermReq after IPCP ConfReq id=0x2 <addr 0.0.0.0> <ms-dns... means? Short snippet: Sep 16 01:39:13 raspberrypi pppd[581]: rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>] Sep 16 ...
1 vote
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1k views

L2TP over IPSec strongswan/xl2tpd pppd interface name changes

I have encountered a possible problem in my VPN setup. I have two different entry points into clients network, so I set two services up and, since one of the VPN-connections is slightly better for us, ...
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1 answer
1k views

L2TP over IPSec strongswan/xl2tpd works on clone but not on original

I'm setting up VPN connection from firm network to clients. Currently: L2TP VPN. My first step was cloning current router-VM (it's a Hyper-V machine). I then proceeded to configure and experiment with ...
0 votes
1 answer
181 views

ssh server doesn't respond on default port (22), but works on custom port

I'm running a Ubuntu 16 based distro on a device, and get no response to ssh requests on port 22 (I am sniffing with tcpdump on the device, and can see the ssh request coming in, but nothing is sent ...
0 votes
1 answer
340 views

L2TP (xl2tpd) IP Address Allocation

I’m making my own study of different ways to establish tunnels between Debian server (LNS) and Android OS (LAC). In case of L2TP without any encryption, LACs should routing traffic through ppp tunnel ...
1 vote
1 answer
2k views

openfortivpn kills my routes

I am trying to use openfortivpn to connect. Previously I had been using the Fortinet VPN client on MS-Windows - I now get blue screens every time I try to start it (I am downloading the upgraded ...
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1 vote
2 answers
778 views

Linux pppoe/pppd won't connect to Centurylink fiber

Equipment: Fedora 27 x86_64 Technicolor C2100T DSL modem/router Unknown Centurylink ONT optical adapter` I recently switched from CL 80mb DSL to CL 1000mb fiber, which still relies on pppoe. I have ...
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1 vote
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FreeRADIUS 3, libradcli4 and ppp compatibility

I'm using Freeradius to authenticate VPN clients using PPTP or L2TP/IPSec (xl2tpd) and I want to do an upgrade from Debian 8 to 9 on our servers incl. upgrading version of Freeradius (2 -> 3). Both ...
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1 vote
1 answer
2k views

Connect into a custom PPPoE server in Ubuntu in an Virtualbox experimental setup. Connection Fail

I am using an Ubuntu Server 18.04.2LTS and I want to try to make it as a ppp server in order to study the protocol a bit better via wireshark. The idea is to use virtualbox and use virtual machines ...
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431 views

pppd not sending auth request to the peer

I am testing pppd dial in to a 4g network. I want to see my side sending auth request to the server. Hence I added 'auth' and 'require-pap' in my local pppd config. But whatever I tried, it seemed ...
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837 views

Linux pppd ipv6 failure: not cannot determine local address

I am trying to use pppd to establish ipv6 connection over a 4g modem. ipv4 has succeeded but ipv6 have not. The pppd is 2.4.7. pppd config: +ipv6 ipv6cp-accept-local Note: the pppd does not ...
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1 vote
0 answers
714 views

Openswan l2tp vpn ppp wrong ip address

Using Openswan with xl2tp on archlinux (4.20) to connect to a vpn, I can create the tunnel and the ppp interface is created howerver it gets the wrong ip address: enp4s0: <BROADCAST,MULTICAST,...
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1 vote
1 answer
3k views

How to route internet to an interface ppp0 that I called to?

My scenario is: host1 has internet connection through interface eth0; host1 dial up host2 and establishes a PPP connection with it; host2 has no internet access; host1 needs to share internet ...
0 votes
2 answers
3k views

Linux pppd fails but NetworkManager works

So I'm trying to get my PtP modem "Telit ME910" connected to the Verizon LTE network via pppd using Ubuntu 16.04. If I hook it up and go through the standard Network Manager steps of "Enable Mobile ...
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1 answer
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PPPD refuse to work with Sierra : HL7690

I am trying to get a working connection with PPPD in 4G with Sierra HL7690. Every time I launch PPPD I get a either a "NO CARRIER" or a Modem hangup. The sequence I use is the following : Reset the ...
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How to setup a PPPoE server on VLAN 10 using pppd on osx?

I'm trying to emulate my ISP setup to configure a few devices remotely before sending it to site. I have a Ubiquiti Edgerouter X that is configured for PPPoE on VLAN 10 using credentials myusername ...
2 votes
1 answer
5k views

PPP / 3G modem not getting an IP: No network protocols running

Modem in use: SIM5310 connected to an ARM based board. root@cm-debian:~# uname -a Linux cm-debian 4.4.0-cm-t335-5.1-00030-gd350d89-dirty #29 SMP Sat Nov 4 19:18:48 PDT 2017 armv7l GNU/Linux I am ...
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2 votes
2 answers
5k views

how to use ssh over serial without using pppd? ( Or how to transfer TCP over serial without using pppd)

There are many virtual machine based on QEMU in my server. Some of them are forbbiden to use networking, and only way to attach them is via virtual serial port. Due to serial console's bad features (...
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108 views

What routing/topology protocol(s) should be used with P2P devices with sporadic, changing connectivity?

I have several IoT devices that will sporadically come into and out of range, and connect in a partial mesh topology. For illustration purposes, imagine the interconnectivity of a Web of Trust, or ...
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500 views

RAS server in linux with analog modem

i known that the analog modem is a old technology, but in my enviroment i need it. I have a server connected to a network 192.168.0.0/24 and all the internet is routed throw 192.168.0.254 and in the ...
3 votes
1 answer
315 views

nftable rules get invalidated on reconnect (VDSL, ppp0)

I'm rebuilding my router using nftables on debian jessie. I have a working setup up to the moment where my ISP decides to reassign a new WAN IP by reconnecting my DSL-link. After such a reconnect the ...
1 vote
0 answers
738 views

connecting Linux pppd to LDAP server to authenticate MSCHAPv2?

I need to provide a remote access VPN service. I'd like very much to use JumpCloud.com to do the user database management. I'm trying to achieve the following: Provide l2tp+ipsec VPN service to users,...
1 vote
0 answers
678 views

Joining a UDP multicast through a server on the other side of the tunnel

I've drawn a diagram below to help with this question! So a company published a multicast UDP feed (company A) and another company connects to it (Company B). I have a point-to-point tunnel to ...
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1 vote
1 answer
3k views

Remove Remote Access Role from WS2012 R2

We have a Windows 2012 R2 server; we use it for AD domain controller and DNS. Can I remove the Remote Access role and the "DirectAccess and VPN (RAS)" Role Service (in Server Manager) from my machine? ...
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0 votes
1 answer
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Tracking pppoe interfaces

I have a set of PPP interfaces on my Linux server. But on bouncing(ifdown; ifup) the interfaces which are not working, the PPP interfaces takes the lowest possible interface number. If I have a PPP ...
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0 votes
1 answer
5k views

How to prevent the pppd to remove the default route?

We use multiple providers, one of them to create connection uses pppoe through pppd daemon on ubuntu 14.04. Early without multiple providers pppd manages default route by itself (creating it when ...
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4 votes
0 answers
669 views

pppd terminated bya SIGTERM in Centos 7 -- who's sending it?

Folks, I created a script to keep a persistent "emergency" connection with a 3G modem, so I can access my CentOS 7 makeshift server remotely if the usual network fails. Everything works for a few ...
1 vote
0 answers
694 views

PPP Adapter answer instead of local NIC

I have set up our DC as a RAS server. I am now aware that this it not a recommended thing to do, but it's done, and it's our only server so it saves me a lot of work if I can keep it like this. It's ...
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0 votes
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1k views

ppp0 connected but cannot route traffic

I have below ppp0 config under peers directory pty "pptp vpnserveraddress.com --nolaunchpppd" name vpnusername password vpnpassword remotename PPTP require-mppe-128 defaultroute usepeerdns debug ...
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1 vote
2 answers
2k views

Seeing Who is Logged into LibreSwan VPN

We recently setup a LibreSwan VPN and for the most part it is working great. One thing we are having some trouble with is trying to see who is currently logged in. I found a solution for seeing ...
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3 votes
1 answer
2k views

What is "the meaning" of this `ip route`?

I'm slowly learning more about IP routing and the ip toolset by investigating a VPN. After I start a particular VPN client, one of the (new) routes displayed by ip route show is 128.0.0.0/1 via 10....
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1 vote
2 answers
2k views

IPv6 PPP Link fails forwarding Router Advertisements into local LAN

A Debian Server having eth0, eth1. eth2, ppp0 devices: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether xx:yy:zz:yy:xx:yy brd ff:ff:ff:ff:...
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EAP-TLS Passthrough from pppd to Radius?

I am setting up an IPSec+L2TP VPN for a couple of Windows boxes connecting to a Debian 7.6 (Wheezy) machine running ipsec tools and xl2tpd/pppd. Client authentication via mschapv2 works well enough; ...
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0 votes
1 answer
156 views

Can't open ports to ouside

I need to open my webserver to internet. I have no idea whats wrong with my config but no ports opened to internet, and server does not respond to ping. I have debian squeeze webserver with following ...
0 votes
2 answers
8k views

how to get ip address of a PPP(Point-to-Point Protocol) network interface?

I have a Linux machine with two network interfaces, and I'd like to get the IP address of the PPP interface w1g1 but it doesn't show up in ifconfig. There is a public IP on the PPP interface, but ...
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Ctrl-C is ignored by pppd when put in a shell script

I'm trying to connect to GPRS network through a serial port connected GSM modem. When I call /usr/sbin/pppd call <peer_name> from the command line, It correctly receives and handles Ctrl+C from ...
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0 votes
1 answer
3k views

Using pppd with a serial port?

I just need to send/receive a messages through a unix-socket with PPP. But at first I want to launch the pppd with an usual serial port to make sure I know how it works. As I see, if I bind a pppd to ...
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2 votes
1 answer
119 views

How to compare 2 TCP/IP stacks or implementations? [closed]

I have to recycle an old machine into a networking node for managing TCP/IP connections and PPP protocols ( basically a DSL connection ); I'm not asking for something more than this, all the tasks ...
1 vote
1 answer
1k views

Set up multiple VPN's with a static ip with PPTP with only 1 vpn-login

I have a VPS with Ubuntu 12.04 x64 and i need to connect 118 VPN's to interfaces with (pon vpnname). I've made a script that creates them all, the problem is that no interface will have a unique local ...
1 vote
1 answer
280 views

Tshark/wireshark on an ephemeral interface

Our server hosts a VPN. Each connection to the VPN creates a new PPP interface (ppp0, ppp1, etc.) and the connections are ephemeral in the sense that the interface can go up or down intermittently. ...
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1 vote
2 answers
183 views

The output of ifconfig for a Internet USB dongle

This question has been asked on the net before but the answers are simply not convincing or even accurate. I get the following output for ifconfig for the ppp0 device (of course, x, y, a, b are ...
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2 votes
1 answer
645 views

Macvlan-interface and PPP-session

I need to pick up two PPP-sessions on the same interface with different MAC-addresses (on some device with openWrt). I decided to check macvlans. I created an interface with another MAC-address. ...
0 votes
0 answers
1k views

Cisco 1841 - Acting as a PPPoE terminator?

We have 2x Fortigate 200B firewalls that we wish to operate in Active/Active HA mode - though, obviously, they cannot do this with PPPoE/DHCP enabled on the externally facing interfaces. To overcome ...
0 votes
1 answer
7k views

PPTP defaultroute. Want to route all traffic via ppp interface

I'm experiencing a problem described here: http://pptpclient.sourceforge.net/howto-diagnosis.phtml#lots_of_data. If I use defaultroute in peer conf or manually add route add default dev ppp0 there ...
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0 votes
2 answers
2k views

Change mtu of ppp0

Every time I log in to my VPN server via ppp, I must change the MTU to 1492 using the following method: ifconfig ppp0 mtu 1492 If I do not do this, then random websites will simply hang up and never ...