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Cisco SDM Express 2.4 User’s Guide
OL-7141-05
Chapter 1 Cisco SDM Express
Supplementary Help
The configuration that will be delivered to the router to disable TCP small servers
is as follows:
no service tcp-small-servers
You can undo this fix using the Cisco SDM Security Audit feature. To learn how,
see the Security Audit online help in Cisco SDM. For more information, click
Cisco Router and Security Device Manager.
Disable UDP Small Servers Service
Cisco SDM Express disables small services whenever possible. By default, Cisco
devices running Cisco IOS release 11.3 or earlier offer the “small services”: echo,
chargen, and discard. (Small services are disabled by default in Cisco IOS
software release 12.0 and later.) These services, especially their UDP versions,
are infrequently used for legitimate purposes, and they can be used to launch DoS
and other attacks that would otherwise be prevented by packet filtering.
For example, an attacker might send a DNS packet, falsifying the source address
to be a DNS server that would otherwise be unreachable, and falsifying the source
port to be the DNS service port (port 53). If such a packet were sent to the router
UDP echo port, the result would be the router sending a DNS packet to the server
in question. No outgoing access list checks would be applied to this packet
because it would be considered to be locally generated by the router itself.
Although most abuses of the small services can be avoided or made less
dangerous by antispoofing access lists, the services should almost always be
disabled in any router which is part of a firewall or lies in a security-critical part
of the network. Because the services are rarely used, the best policy is usually to
disable them on all routers of any description.
The configuration that will be delivered to the router to disable UDP small servers
is as follows:
no service udp-small-servers
You can undo this fix using the Cisco SDM Security Audit feature. To learn how,
see the Security Audit online help in Cisco SDM. For more information, click
Cisco Router and Security Device Manager.
- 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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