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Connecting to an l2tp VPN via script doesnt always use the same network interface
Problem connecting to remote network using demand-dial VPN interface with Windows Server 2003Assistance on setup to Connect an offsite server to the LAN via RRAS VPN - Server 2008 R2Can't get the L2TP IPSEC up and runningGetting PPPD to log successful CHAP authenticationRouting all data through an VPN tunnel with pppStrongSwan + xl2tpd client timeout between 2-5 minutesStrange route traces when connecting to L2TP/IPsec VPNSonicWall - connecting to L2TP VPN from DMZIPSec/L2TP VPN server with multiple IP: connect with different ip failUnable to connect to L2TP VPN network with Fedora 29
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I have a linux web server and I need to create an on-demand l2tp ipsec VPN connection with a network route. The VPN connection works and the route is automatically created via a script in /etc/ppp/ip-up.d that expects device ppp0. Everything works fine when I run the following on the command line:
echo "c myvpn" > /var/run/xl2tpd/l2tp-control
As expected, the vpn connects via ppp0 and my route is created. However, when I run this exact same command from a script, sometimes the VPN connects using ppp1 which causes the route creation to fail.
Why is this happening? There is no other network activity going on. Is there a way to specify which network interface gets used?
linux networking vpn scripting
asked May 8 at 13:12
Josh KimJosh Kim
31
add a comment |
I have a linux web server and I need to create an on-demand l2tp ipsec VPN connection with a network route. The VPN connection works and the route is automatically created via a script in /etc/ppp/ip-up.d that expects device ppp0. Everything works fine when I run the following on the command line:
echo "c myvpn" > /var/run/xl2tpd/l2tp-control
As expected, the vpn connects via ppp0 and my route is created. However, when I run this exact same command from a script, sometimes the VPN connects using ppp1 which causes the route creation to fail.
Why is this happening? There is no other network activity going on. Is there a way to specify which network interface gets used?
linux networking vpn scripting
asked May 8 at 13:12
Josh KimJosh Kim
31
add a comment |
I have a linux web server and I need to create an on-demand l2tp ipsec VPN connection with a network route. The VPN connection works and the route is automatically created via a script in /etc/ppp/ip-up.d that expects device ppp0. Everything works fine when I run the following on the command line:
echo "c myvpn" > /var/run/xl2tpd/l2tp-control
As expected, the vpn connects via ppp0 and my route is created. However, when I run this exact same command from a script, sometimes the VPN connects using ppp1 which causes the route creation to fail.
Why is this happening? There is no other network activity going on. Is there a way to specify which network interface gets used?
linux networking vpn scripting
asked May 8 at 13:12
Josh KimJosh Kim
31
I have a linux web server and I need to create an on-demand l2tp ipsec VPN connection with a network route. The VPN connection works and the route is automatically created via a script in /etc/ppp/ip-up.d that expects device ppp0. Everything works fine when I run the following on the command line:
echo "c myvpn" > /var/run/xl2tpd/l2tp-control
As expected, the vpn connects via ppp0 and my route is created. However, when I run this exact same command from a script, sometimes the VPN connects using ppp1 which causes the route creation to fail.
Why is this happening? There is no other network activity going on. Is there a way to specify which network interface gets used?
linux networking vpn scripting
linux networking vpn scripting
asked May 8 at 13:12
Josh KimJosh Kim
31
asked May 8 at 13:12
Josh KimJosh Kim
31
asked May 8 at 13:12
Josh KimJosh Kim
31
asked May 8 at 13:12
Josh KimJosh Kim
31
asked May 8 at 13:12
Josh KimJosh Kim
31
31
add a comment |
add a comment |
1 Answer
1
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votes
By default the name of ppp interface isn't fixed, but you can change this behaviour with unit 0 option in the pppd options file (0 is the numeric suffix of ppp interface name), that used by xl2tpd (option pppoptfile in the xl2tpd configuration file). To monitor activity of network stack you can use ip monitor command.
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Adddebugoption into the pppd option file and check the logs to investigate what happens.
– Anton Danilov
May 8 at 19:34
add a comment |
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1 Answer
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1 Answer
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votes
By default the name of ppp interface isn't fixed, but you can change this behaviour with unit 0 option in the pppd options file (0 is the numeric suffix of ppp interface name), that used by xl2tpd (option pppoptfile in the xl2tpd configuration file). To monitor activity of network stack you can use ip monitor command.
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Adddebugoption into the pppd option file and check the logs to investigate what happens.
– Anton Danilov
May 8 at 19:34
add a comment |
By default the name of ppp interface isn't fixed, but you can change this behaviour with unit 0 option in the pppd options file (0 is the numeric suffix of ppp interface name), that used by xl2tpd (option pppoptfile in the xl2tpd configuration file). To monitor activity of network stack you can use ip monitor command.
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Adddebugoption into the pppd option file and check the logs to investigate what happens.
– Anton Danilov
May 8 at 19:34
add a comment |
By default the name of ppp interface isn't fixed, but you can change this behaviour with unit 0 option in the pppd options file (0 is the numeric suffix of ppp interface name), that used by xl2tpd (option pppoptfile in the xl2tpd configuration file). To monitor activity of network stack you can use ip monitor command.
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
By default the name of ppp interface isn't fixed, but you can change this behaviour with unit 0 option in the pppd options file (0 is the numeric suffix of ppp interface name), that used by xl2tpd (option pppoptfile in the xl2tpd configuration file). To monitor activity of network stack you can use ip monitor command.
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
answered May 8 at 16:59
Anton DanilovAnton Danilov
91567
91567
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Adddebugoption into the pppd option file and check the logs to investigate what happens.
– Anton Danilov
May 8 at 19:34
add a comment |
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Adddebugoption into the pppd option file and check the logs to investigate what happens.
– Anton Danilov
May 8 at 19:34
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Thank you. I tried this and it ends up working but it takes a few connection attempts for me. I see log output with ppp1 but it seems to always end up connecting on ppp0. I think I get this issue when I try to connect quickly after disconnecting. Maybe this is a kernel issue?
– Josh Kim
May 8 at 17:46
Add
debug option into the pppd option file and check the logs to investigate what happens.– Anton Danilov
May 8 at 19:34
Add
debug option into the pppd option file and check the logs to investigate what happens.– Anton Danilov
May 8 at 19:34
add a comment |
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