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Cisco SDM Express 2.4 User’s Guide
OL-7141-05
Chapter 1 Cisco SDM Express
Supplementary Help
interfaces that no other work gets done. Some very fast packet floods can cause
this condition. It may stop administrative access to the router, which is very
dangerous when the device is under attack. The scheduler allocate command
guarantees a percentage of the router CPU processes for activities other than
network switching, such as management processes.
The configuration that will be delivered to the router to set the scheduler allocate
percentage is as follows:
scheduler allocate 4000 1000
Set TCP Synwait Time
Cisco SDM Express sets the TCP synwait time to 10 seconds whenever possible.
The TCP synwait time is a value that is useful in defeating SYN flooding attacks,
a form of Denial-of-Service (DoS) attack. A TCP connection requires a
three-phase handshake to initially establish the connection. A connection request
is sent by the originator, an acknowledgement is sent by the receiver, and then an
acceptance of that acknowledgement is sent by the originator. After this
three-phase handshake is complete, the connection is complete and data transfer
can begin. A SYN flooding attack sends repeated connection requests to a host,
and never sends the acceptance of acknowledgements that complete the
connections, creating increasingly more incomplete connections at the host.
Because the buffer for incomplete connections is usually smaller than the buffer
for completed connections, this can overwhelm and disable the host. Setting the
TCP synwait time to 10 seconds causes the router to shut down an incomplete
connection after 10 seconds, preventing the buildup of incomplete connections at
the host.
The configuration that will be delivered to the router to set the TCP synwait time
to 10 seconds is as follows:
ip tcp synwait-time <10>
Enable Logging
Cisco SDM Express will enable logging with time stamps and sequence numbers
whenever possible. Because it gives detailed information about network events,
logging is critical in recognizing and responding to security events. Time stamps
and sequence numbers provide information about the date, time, and sequence in
which network events occur.
- Customer Order Number: 1
- Text Part Number: OL-7141-05 1
- CONTENTS 3
- Contents 4
- Ol-7141-04 4
- Date and Time Properties 15 6
- Reset to Factory Defaults 16 6
- Feature Not Available 19 6
- Cisco SDM Express 7
- Router Provisioning 9
- Provision From USB Flash 11
- File Selection 12
- LAN Interface Configuration 13
- IP Address Field 14
- Subnet Mask Field 14
- Subnet Bits Field 14
- Wireless Parameters Fields 14
- DHCP Server Configuration 15
- Ending IP Address Field 16
- Domain Name Field 16
- Enable PPPoE Check Box 17
- Address Type List 17
- Authentication Type Check Box 18
- Username Field 18
- Password Field 18
- Confirm Password Field 18
- OL-7141-05 19
- Encapsulation List 20
- Virtual Path Identifier Field 20
- WAN Interface Selection 22
- Serial Connection 23
- DLCI Field 25
- LMI Type Field 25
- CNS Server Information 26
- Firewall Configuration 27
- Security Settings 28
- Encrypt Passwords Check Box 30
- Supplementary Help 31
- Cisco Network Services 32
- Disable PAD Service 34
- Disable CDP 37
- Disable IP Source Route 37
- Enable Netflow Switching 38
- Enable IP CEF 40
- Set Scheduler Interval 40
- Set Scheduler Allocate 40
- Set TCP Synwait Time 41
- Enable Logging 41
- <log buffer size> 42
- <outside interface> 42
- Disable IP Gratuitous ARPs 43
- Disable IP Redirects 43
- Disable IP Proxy ARP 43
- Disable IP Directed Broadcast 44
- Disable MOP Service 45
- Disable IP Unreachables 45
- Disable IP Mask Reply 45
- Set Banner 47
- Enable Telnet Settings 47
- Cisco SDM Express Buttons 49
- Apply Changes Button 50
- Discard Changes Button 50
- SDP Troubleshooting Tips 51
- Troubleshooting Tips 52
- Cisco SDM Express Edit Mode 53
- Internet (WAN) Fields 54
- Firewall Fields 54
- Basic Configuration 55
- Edit a Username 56
- Wireless 57
- No WAN Available 57
- Delete Connection 58
- Firewall 58
- Refresh Button 59
- Unable to Configure NAT 59
- • Web server 60
- • Email server 60
- Original Port 61
- Translated Port 61
- Protocol 61
- Enable Check Box 61
- Forwarding (Next Hop) Field 61
- Encrypt Passwords Checkbox 63
- Ping Option 64
- Telnet Option 64
- Cisco SDM Option 64
- Software Update Option 64
- Update SDM from Cisco.com 65
- Update SDM from Local PC 66
- Update SDM from CD 66
- Date and Time Properties 67
- Reset to Factory Defaults 68
- Microsoft Windows NT 70
- Microsoft Windows ME 70
- Microsoft Windows 2000 70
- Microsoft Windows XP 70
- Feature Not Available 71
- OL-7141-04 73
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