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Chapter 3: Troubleshooting Network Address
Translation
In This Chapter:
Introduction ......................................................................................................................................................22
Resolving Common NAT Problems ...............................................................................................................22
Optimizing Network Performance with NAT...................................................................................................22
How to NAT (Network Address Translate) a DMZ host accessed by external hosts without applying the NAT
on the internal network...................................................................................................................................22
How to set up Hide Mode Address Translation behind a dynamic address...................................................23
How to use Encryption with NAT and ICMP...................................................................................................23
How to Connect several illegal IP networks through the Internet...................................................................23
Is there a limitation on XLATE_HIDE? ...........................................................................................................24
How to Configure SecuRemote with Split DNS for an Internal DNS Server..................................................24
How to use NAT when the IP address is embedded in the data area............................................................24
Does the ident service work with Hide NAT?.................................................................................................25
If the external IP address of the FireWall is an illegal address, can you connect to it via SecuRemote?......25
“Leaky” NAT ...................................................................................................................................................26
Cause..........................................................................................................................................................26
Troubleshooting ..........................................................................................................................................26
How to workaround this issue.....................................................................................................................26
1. Increase the TCP timeout value..........................................................................................................26
2. Increase TCP timeout for a specific service........................................................................................26
3. Increase the value out of the TCP start time out (tcpstarttimeout) parameter....................................26
4. Increase the value of the TCP end timeout (tcpendtimeout): .............................................................27
5. Change the relevant service to a service of type 'other' and not 'TCP':..............................................27
6. Applying the ACK Denial-Of-Service hotfix.........................................................................................27
Debugging NAT................................................................................................................................................28
More Information..............................................................................................................................................28
- VPN-1/FireWall-1 1
- Contents 2
- Table of Contents 3
- WhoshouldusethisGuide 6
- Feedback Please! 6
- Summary of Contents 7
- Troubleshooting Guidelines 8
- In This Chapter: 10
- Troubleshooting Tools 11
- UNIX only) 12
- Explanation 13
- offset of IP in 17
- FireWall-1 Monitor Command 21
- Examples 22
- Debugging with INSPECT 24
- Translation 26
- Resolving Common NAT Problems 27
- “Leaky” NAT 31
- Debugging NAT 33
- BayRS router 36
- Controlling the FireWall 37
- Licenses 38
- Problems and bugs 38
- BayRS Router Commands 39
- VPN-1/FireWall-1 Commands: 40
- General Commands 40
- General problems 41
- Common problems resolution 43
- Information to Gather 44
- Spoofing 49
- Debugging of Cisco Routers 49
- Debugging of 3Com Routers 51
- Debugging 52
- Troubleshooting Anti-Spoofing 54
- Static ARP and Anti-Spoofing 55
- Debugging Anti-Spoofing 56
- Content Security 57
- SMTP Security Server 58
- Debugging Security servers 58
- HTTP Security server 59
- IP Interface 60
- The Software 60
- VPN-1/FireWall-1 Rule Base 60
- Diagram of the environment 61
- Performance Test 62
- Discussion 63
- Action Plan 63
- Conclusions 64
- HTTP Security Server and DNS 66
- Test Plan 68
- The Solaris machines 69
- The VPN/FireWall module 69
- The security servers 69
- The CVP server 69
- Test Results 70
- FTP Security Server 71
- Fast mode and FTP 73
- FTP PASV vulnerability: 74
- PORT command is blocked 74
- Server fails 78
- Log Viewer Error Messages 80
- Log Viewer 81
- Security Server? 82
- Chapter 2: Security Servers 84
- Chapter 3: Content Security 84
- Troubleshooting LDAP Issues 87
- Installation Issues 88
- Configuration Issues 88
- Schema Checking 89
- Known configuration problems 90
- AMC Configuration problem 91
- Working with the AMC 92
- Creating a Tree Object 93
- Defining Users 93
- The LDAP server 93
- Working with LDAP 94
- Known LDAP and AMC problems 94
- Exporting Users Problems 95
- Special Configurations 96
- PKI Issues related to LDAP 96
- Known Limitations 97
- Debugging LDAP 98
- More Information 100
- Management 101
- What Tables are synchronized 104
- Synchronization Tests 104
- Troubleshooting Fail-over 106
- Problem Detection Devices 107
- Troubleshooting Fail-Over 108
- VPN Fail-Over 108
- Debugging High-Availability 111
- Load Balancing Components 112
- Stealth Rule 114
- Check_alive table 114
- Balance does not work 115
- Troubleshooting SNMP 120
- Node n Node 2 Node 1 123
- External Network 123
- Internal IP 124
- Bank Certificate Key (BCK) 125
- Product Features Lists 126
- How to Verify Licenses 127
- Licensing non IP hosts 128
- License installation 129
- In This Chapter 132
- Introduction 133
- Rule Base 133
- Network Address translation 133
- Anti Spoofing 133
- High Availability 135
- Security Servers 135
- BAY Router 136
- Open Security Extension (OSE) 137
- Mission Statement 139
- Telephone 139
- Problem Severity Definitions 142
- Software Versions Supported 142
- Escalation Procedure 142
- In This Appendix: 143
- What are State Tables? 146
- Table Attributes 147
- General tables 148
- SAMP tables 152
- License enforcement tables 153
- Logging tables 154
- NAT tables 156
- VPN tables 158
- SKIP tables 159
- NSID value Description 160
- IKE tables 161
- IPSec tables 161
- SPI_table table 162
- Load balancing tables 170
- Specific services tables 172
- RPC tables 174
- Program Number Description 175
- 100001 Rstat 175
- 100004 Ypserv 175
- 100007 Ypbind 175
- 100300 NIS+ 175
- DCE/RPC tables 176
- IIOP tables 177
- Static tables (lists) 177
- Object Lists tables 178
- Time Objects tables 180
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