48 lines
1.8 KiB
Markdown
48 lines
1.8 KiB
Markdown
# xl2tpd
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[](https://travis-ci.org/xelerance/xl2tpd)
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xl2tpd is a **FREE** implementation of the Layer 2 Tunneling Protocol
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as defined by [RFC 2661](https://tools.ietf.org/rfc/rfc2661.txt).
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L2TP allows you to tunnel PPP over UDP. Some ISPs use L2TP to tunnel user
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sessions from dial-in servers (modem banks, ADSL DSLAMs) to back-end PPP
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servers. Another important application is Virtual Private Networks where
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the IPsec protocol is used to secure the L2TP connection (L2TP/IPsec is
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defined by [RFC 3193](https://tools.ietf.org/rfc/rfc3193.txt). xl2tpd can
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be used in combination with IPsec implementations such as Openswan. Example
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configuration files for such a setup are included in the examples directory.
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xl2tpd uses a pseudo-tty to communicate with pppd.
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It runs in userspace but supports kernel mode L2TP.
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xl2tpd supports IPsec SA Reference tracking to enable overlapping internal
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NAT'ed IP's by different clients (eg all clients connecting from their
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linksys internal IP 192.168.1.101) as well as multiple clients behind
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the same NAT router.
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Xl2tpd is based on the L2TP code base of Jeff McAdams <jeffm@iglou.com>.
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It was de-facto maintained by Jacco de Leeuw <jacco2@dds.nl> in 2002 and 2003.
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NOTE: In Linux kernel 4.15+ there is a kernel bug with ancillary IP_PKTINFO.
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As such, for Linux kernel 4.15+ we recommend the community use xl2tpd
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1.3.12+
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## Build and install
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make
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sudo make install
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The xl2tpd.conf(5) man page has details on how to configure xl2tpd.
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## Mailing Lists
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https://lists.openswan.org/cgi-bin/mailman/listinfo/xl2tpd
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is home of the mailing list.
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Note: This is a closed list - you **must** be subscribed to be able
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to post mails.
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## Security Vulnerability
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Security vulnerabilities can be e-mailed to: security@xelerance.com
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