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-rw-r--r--sys/conf/NOTES3
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/conf/NOTES b/sys/conf/NOTES
index 294b271e08735..a7d41d0e3cd77 100644
--- a/sys/conf/NOTES
+++ b/sys/conf/NOTES
@@ -427,6 +427,8 @@ device musycc # LMC/SBE LMC1504 quad T1/E1
# The `gif' device implements IPv6 over IP4 tunneling,
# IPv4 over IPv6 tunneling, IPv4 over IPv4 tunneling and
# IPv6 over IPv6 tunneling.
+# The `gre' device implements two types of IP4 over IP4 tunneling:
+# GRE and MOBILE, as specified in the RFC1701 and RFC2004.
# The XBONEHACK option allows the same pair of addresses to be configured on
# multiple gif interfaces.
# The `faith' device captures packets sent to it and diverts them
@@ -453,6 +455,7 @@ device disc #Discard device (ds0, ds1, etc)
device tap #Virtual Ethernet driver
device tun #Tunnel driver (ppp(8), nos-tun(8))
device sl #Serial Line IP
+device gre #IP over IP tunneling
device ppp #Point-to-point protocol
options PPP_BSDCOMP #PPP BSD-compress support
options PPP_DEFLATE #PPP zlib/deflate/gzip support