topic Re: Allowing NTP on all interfaces in Network Security https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320984#M828967 <HTML><HEAD></HEAD><BODY><P>great, thank you</P></BODY></HTML> Thu, 30 Jul 2009 01:29:11 GMT insccisco 2009-07-30T01:29:11Z Allowing NTP on all interfaces https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320982#M828956 <P>Hi guys,</P><P></P><P>I have configured my 1841 router to be a Master NTP server.</P><P></P><P>This router has 5 VLANS and hosts coming from all those VLANs can successfully act as NTP clients to get the proper time from the 1841. However, on one of those VLANs, I have an access list applied and hosts on this VLAN can't talk to the NTP master (the 1841)</P><P></P><P>What do I need to allow on the ACL to allow hosts on this VLAN to use the 1841 as their master NTP?</P><P></P><P></P><P></P> Mon, 11 Mar 2019 16:00:29 GMT https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320982#M828956 insccisco 2019-03-11T16:00:29Z Re: Allowing NTP on all interfaces https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320983#M828963 <HTML><HEAD></HEAD><BODY><P>NTP runs on UDP 123 so you'll have to open up that port.</P><P></P><P>Hope it helps.</P></BODY></HTML> Wed, 29 Jul 2009 18:03:03 GMT https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320983#M828963 Collin Clark 2009-07-29T18:03:03Z Re: Allowing NTP on all interfaces https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320984#M828967 <HTML><HEAD></HEAD><BODY><P>great, thank you</P></BODY></HTML> Thu, 30 Jul 2009 01:29:11 GMT https://community.cisco.com/t5/network-security/allowing-ntp-on-all-interfaces/m-p/1320984#M828967 insccisco 2009-07-30T01:29:11Z