topic Emails over 15Mbs fail on IOS FW in Network Security https://community.cisco.com/t5/network-security/emails-over-15mbs-fail-on-ios-fw/m-p/664452#M1010312 <P>Hi, </P><P></P><P>I have a Cisco 1841 providing internet access with FW and NAT.</P><P></P><P>The customer has an Exchange server on the internal network. When they send emails with attachments over 15Mbs in size they fail. Emails with attachments under this size are fine.</P><P></P><P>They have also removed the C1841 and replaced it with a non-cisco firewall and emails were fine.</P><P></P><P>Does anyone know what on the IOS FW would cause this? Would one of the inspection rules be causing the problem?</P><P></P><P>Any advice/help would be appreciated.</P><P></P><P>Thanks,</P><P>Chris </P> Mon, 11 Mar 2019 09:46:45 GMT ccpagel 2019-03-11T09:46:45Z Emails over 15Mbs fail on IOS FW https://community.cisco.com/t5/network-security/emails-over-15mbs-fail-on-ios-fw/m-p/664452#M1010312 <P>Hi, </P><P></P><P>I have a Cisco 1841 providing internet access with FW and NAT.</P><P></P><P>The customer has an Exchange server on the internal network. When they send emails with attachments over 15Mbs in size they fail. Emails with attachments under this size are fine.</P><P></P><P>They have also removed the C1841 and replaced it with a non-cisco firewall and emails were fine.</P><P></P><P>Does anyone know what on the IOS FW would cause this? Would one of the inspection rules be causing the problem?</P><P></P><P>Any advice/help would be appreciated.</P><P></P><P>Thanks,</P><P>Chris </P> Mon, 11 Mar 2019 09:46:45 GMT https://community.cisco.com/t5/network-security/emails-over-15mbs-fail-on-ios-fw/m-p/664452#M1010312 ccpagel 2019-03-11T09:46:45Z Re: Emails over 15Mbs fail on IOS FW https://community.cisco.com/t5/network-security/emails-over-15mbs-fail-on-ios-fw/m-p/664453#M1010316 <HTML><HEAD></HEAD><BODY><P>First thing you can try is in regard of CBAC set the default size to 20Mb or more. Following document may help you regarding it</P><P><A class="jive-link-custom" href="http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a00801a7f84.html#wp1185863" target="_blank">http://www.cisco.com/en/US/products/sw/iosswrel/ps5207/products_command_reference_chapter09186a00801a7f84.html#wp1185863</A></P><P></P><P>As a last option you may remove the inspection to see if this fixes your problem. Use following command for this</P><P>no ip inspect name DEFAULT100 smtp</P></BODY></HTML> Wed, 21 Mar 2007 15:21:37 GMT https://community.cisco.com/t5/network-security/emails-over-15mbs-fail-on-ios-fw/m-p/664453#M1010316 thomas.chen 2007-03-21T15:21:37Z