topic Re: Problems configuring firewall in Network Security https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881943#M973944 <HTML><HEAD></HEAD><BODY><P>Either subnet the two interfaces so they are logically different or change one of them to a new subnet.</P></BODY></HTML> Fri, 05 Oct 2007 17:26:35 GMT whisperwind 2007-10-05T17:26:35Z Problems configuring firewall https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881942#M973943 <P>Hi,</P><P></P><P>I have a 1721 cisco router with the ethernet port and a lan wic.</P><P></P><P>The router has 192.168.156.252 ip configured. We have configured with 192.168.156.25 ip address a router connected by my isp.This router has been configured with this ip, we can not change it or enter to administer the software.</P><P></P><P>I tried to connect a lan wire from this router(teldat) to the 1721 ethenet wic port and use the IOS firewall to filter certain ports.. protocols and more...</P><P></P><P>Using SDM 2.4.1 I tried to configure the firewall but the wizard says that they have the same lan ip and it is impossible.</P><P></P><P>what can I do?</P><P></P><P>best regards</P> Mon, 11 Mar 2019 11:21:06 GMT https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881942#M973943 edgar-quintana 2019-03-11T11:21:06Z Re: Problems configuring firewall https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881943#M973944 <HTML><HEAD></HEAD><BODY><P>Either subnet the two interfaces so they are logically different or change one of them to a new subnet.</P></BODY></HTML> Fri, 05 Oct 2007 17:26:35 GMT https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881943#M973944 whisperwind 2007-10-05T17:26:35Z Re: Problems configuring firewall https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881944#M973945 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I do not understand you.</P><P></P><P>Can you explain better?</P><P></P><P>Best regards</P></BODY></HTML> Fri, 05 Oct 2007 22:49:55 GMT https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881944#M973945 edgar-quintana 2007-10-05T22:49:55Z Re: Problems configuring firewall https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881945#M973946 <HTML><HEAD></HEAD><BODY><P>I will try, put a different network on the interface so they do not overlap, you can either use subnetting or something like</P><P></P><P>10.0.0.1 255.255.255.0</P><P></P><P>I recommend you google subnetting and read up on it.</P></BODY></HTML> Sun, 07 Oct 2007 12:57:35 GMT https://community.cisco.com/t5/network-security/problems-configuring-firewall/m-p/881945#M973946 whisperwind 2007-10-07T12:57:35Z