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Thank you for your for your fast reply. &nbsp;Due to your suggestion, i found in some IOS, it can save debug message and show it in router. <br />
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it looks like the command <b> &quot;logging file flash:&lt;filename&gt;&quot; </b> could not be typed in. Maybe it need different version of ios, right ?
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Thank you for your for your fast reply.  Due to your suggestion, i found in some IOS, it can save debug message and show it in router.

it looks like the command "logging file flash:<filename>" could not be typed in. Maybe it need different version of ios, right ?

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Experts<br />
After the logging console 7 is configured, the debug messages can be watched via console in the router/Pix. But when I want to watch history debug message via some command &quot;show logging history&quot;, i did not find these debug message. Any experts can give me some suggestions ? Thank you.
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Experts
After the logging console 7 is configured, the debug messages can be watched via console in the router/Pix. But when I want to watch history debug message via some command "show logging history", i did not find these debug message. Any experts can give me some suggestions ? Thank you.

How to save and check the debug message in router

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.

Routers

Cisco PIX is a dedicated hardware firewall appliance; the Cisco Adaptive Security Appliance (ASA) is a firewall and anti-malware security appliance that provides unified threat management and protection the PIX does not. Other Cisco devices and systems include routers, switches, storage networking, wireless and the software and hardware for PIX Firewall Manager (PFM), PIX Device Manager (PDM) and Adaptive Security Device Manager (ASDM).