Network Security

Hi, I have a Cisco 1841 providing internet access with FW and NAT.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.They ...

We have a DACS unit made by an Asian Telecom company whose E-Net port is not user-configurable. Always does 10/100 auto-negotiate. Dozens are installed and working fine. We have two that are tied to two seperate 2950's using IOS v12.1 and after 48 ho...

I need to double check if my thinking is correct regarding this.I plan to migrate my firewalling from a Pix525 to a FWSM. Both these are operational today the Pix is serving client dynamic PAT, VPN termination and incoming server access and the FWSM ...

Whenever I create a VLAN and I assign a static mac address to it, the static mac address appears in ports not assigned to a vlan , interestingly, the static mac address does not appear in vlan 1, the management vlan.What may be the problem?

I have a catalyst 6500 switch on my network and I know it supports an IDS module.What I am not sure is an IPS.Could somebody who knows be kind enough to tell me if there is the support of IPS in the Catalyst 6500 switch.

HI. I have a PIX 525 and I need to configure it like a VPN server. Anybody can help me? Anybody knows a url with that steps? Thanks

hello all,I want a PIX535 firewall to be synchronized by an outside NTP server , then all the inside hosts get time from the firewall 。I fail to get time from the firewall .Can anybody confirm that PIX firewall just support to be NTP client ? Thanks ...

Hi I would like to check what is the use of this fixup protocol in ASA or PIX.Just a question to understand this better.Thanks!

Hi,I am planning to use a ASA 5510 for the following scenario:1) two security-zones: one for office, one for exposed services such as mail-relay etc. (dmz)2) one leased line/frame-relay routed via CISCO 2600 is connected to the outside interface of A...

How can i see the certificates on pix divice ? what kinde of certificate is needed for PDM? and for Pix to host VPN connections?THANDK YOU!

Hi there,I am a little confused with what the inbound means in the command 'aaa authenticaion include ...'. Does it mean the traffic is from low security interface to high security interface, or any traffic come into the PIX?Thanks in advance!Regards...

Hi,We are facing some problem with VPN tunnel from router to router.We are forming tunnel from R1 to R2 on loopback address. It was working ok and suddenly it is showing status as down.I am attaching debug cry ipsec output here in text mode.Here we s...

Hi,In a PIX 515, os Version 6.3(5), I want to prevent traffic TCP ports 445, 3066, 3067 from going from inside to outside (due to us having gotten blacklisted for outgoing Korgo traffic).Here's the relevant config:access-list acl_outbound deny tcp an...

I have a LAN connection to an ASA here in my office, but I'm constantly running into the message in the subject field of this post. When things get really bad, some of my changes make it into the running config while others just end up in the bit buc...