diff options
Diffstat (limited to 'usr.sbin/ntp/doc/ntp.conf.5')
| -rw-r--r-- | usr.sbin/ntp/doc/ntp.conf.5 | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/usr.sbin/ntp/doc/ntp.conf.5 b/usr.sbin/ntp/doc/ntp.conf.5 index 4e45240..42af4a5 100644 --- a/usr.sbin/ntp/doc/ntp.conf.5 +++ b/usr.sbin/ntp/doc/ntp.conf.5 @@ -1,11 +1,11 @@ -.Dd April 26 2016 +.Dd June 2 2016 .Dt NTP_CONF 5 File Formats .Os .\" EDIT THIS FILE WITH CAUTION (ntp.mdoc) .\" .\" $FreeBSD$ .\" -.\" It has been AutoGen-ed April 26, 2016 at 08:28:36 PM by AutoGen 5.18.5 +.\" It has been AutoGen-ed June 2, 2016 at 07:36:16 AM by AutoGen 5.18.5 .\" From the definitions ntp.conf.def .\" and the template file agmdoc-cmd.tpl .Sh NAME @@ -2442,6 +2442,7 @@ The default value is 46, signifying Expedited Forwarding. .Cm calibrate | Cm kernel | .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | +.Cm peer_clear_digest_early | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early .Oc .Xc @@ -2451,6 +2452,7 @@ The default value is 46, signifying Expedited Forwarding. .Cm calibrate | Cm kernel | .Cm mode7 | Cm monitor | .Cm ntp | Cm stats | +.Cm peer_clear_digest_early | .Cm unpeer_crypto_early | Cm unpeer_crypto_nak_early | Cm unpeer_digest_early .Oc .Xc @@ -2518,6 +2520,26 @@ closes the feedback loop, which is useful for testing. The default for this flag is .Ic enable . +.It Cm peer_clear_digest_early +By default, if +.Xr ntpd 8 +is using autokey and it +receives a crypto\-NAK packet that +passes the duplicate packet and origin timestamp checks +the peer variables are immediately cleared. +While this is generally a feature +as it allows for quick recovery if a server key has changed, +a properly forged and appropriately delivered crypto\-NAK packet +can be used in a DoS attack. +If you have active noticable problems with this type of DoS attack +then you should consider +disabling this option. +You can check your +.Cm peerstats +file for evidence of any of these attacks. +The +default for this flag is +.Ic enable . .It Cm stats Enables the statistics facility. See the |
