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Appendix A – Disposition of Events
Multi-Tech Systems, Inc. RouteFinderVPN RF760/660/600VPN User Guide (PN S000323D) 144
Inbound Access (DNAT with Connection Tracking)
Figure 3
– Inbound Access (DNAT with Connection Tracking)
Description of Figure 3
The Access request originated from the source (204.26.122.9) to the destination (204.54.39.103), which is further
DNATTED to the ip-address 192.168.1.76 on port 20:21.
The above figure illustrates a capture of the FTP service.
• Slno 1, in the above snapshot corresponds to the control connection (Remarks in the second half of the snapshot
is a continuation of the capture).
Remarks:
“Inbound Accepted DNAT ip:port = 192.168.1.76:20:21”
Src: 204.26.122.9, Dst: 202.54.39.103, DNATTED to 192.168.1.76 on Port 20:21.
• Slno 2, corresponds to a PASV Data connection. (Src:204.26.122.9, destined to 202.54.39.103, which in turn is
DNATTED to 192.168.1.76 on port 62191).
Remarks:
“Inbound Accepted
[SRC=204.26.122.9:DST=202.54.39.103:SPORT=41216:DPORT=21]
Dnat ip:port = 192.168.1.76:21”
o Inbound Accepted – Inbound Log
o [SRC=204.26.122.9:DST=202.54.39.103:SPORT=41216:DPORT=21] – This corresponds to the
“CONTROL connection information” for this data connection.
o Dnat ip:port = 192.168.1.76:21” – This corresponds to the “CONTROL connection’s DNATTED
ipaddress” for this data connection.
• Slno 3, corresponds to the ACTIVE Data connection originated from 192.168.1.76 (on SRC-PORT 20), which is
masqueraded to a SRC:202.54.39.103 at the WAN interface of the candidate firewall, destined to 204.26.122.9.
Remarks:
“Inbound Accepted
[SRC=204.26.122.9:DST=202.54.39.103:SPORT=41216:DPORT=21]
Dnat ip:port = 192.168.1.76:21”
o Inbound Accepted – Inbound Log
o [SRC=204.26.122.9:DST=202.54.39.103:SPORT=41216:DPORT=21] – This corresponds to the
“CONTROL connection information” for this data connection.
o Dnat ip:port = 192.168.1.76:21” – This corresponds to the “CONTROL connection’s DNATTED
ipaddress” for this data connection.
- RF760/660/600VPN 1
- Internet Security Appliance 1
- User Guide 1
- Contents 3
- Features, and Overview 7
- Feature Highlights 8
- Ship Kit Contents 9
- License Keys 10
- Safety Warnings 11
- RouteFinder Front Panels 12
- RF600VPN 13
- RouteFinder Back Panels 14
- Specifications 15
- Power & Physical 16
- Description 16
- RF760VPN RF660VPN RF600VPN 16
- The Firewall 17
- Protection Mechanisms 18
- Typical Applications 20
- Chapter 2 – Installation 21
- Planning the Network 22
- Installation Overview 23
- RouteFinder VPN 24
- Sub-Menu 27
- Menus and Sub-Menus 27
- Chapter 3 – Configuration 28
- Second Configuration Step 29
- The Wizard Setup Screen 30
- Set Packet Filters 33
- Set VPN IPSec Protocol 34
- Configuring Site B 35
- Using DNAT and Aliasing 37
- Tunneling 38
- Important Settings 39
- Menu Bar 42
- Administration 43
- System Logging 44
- System Time 44
- SNMP Agent – Community Name 44
- Administration > SSH 45
- SNTP Client 46
- SNTP Server Address 46
- Click Save 49
- Intrusion Detection 51
- Network Intrusion Detection 51
- Administration > Tools 52
- Trace Route 53
- TCP Connect 53
- Prerequisite 55
- RADIUS Prerequisite 56
- SAM Prerequisite 57
- Administration > Restart 58
- Administration > Shutdown 58
- Networks & Services 59
- Add Services 61
- Notes About Protocols 62
- About the Screen 63
- Add Network Group 63
- Add Service Group 64
- Proxy > HTTP Proxy 66
- Add Custom URL List 69
- Proxy > SMTP Proxy 71
- SMTP SPAM Filtering 74
- Proxy > POP3 Proxy 77
- POP3 SPAM Protection 78
- POP3 SPAM Filtering 78
- Proxy > SOCKS Proxy 80
- Proxy > DNS Proxy 82
- Network Setup 83
- Network Setup > Interface 84
- Network Cards 85
- IP Aliases 85
- Network Setup > PPP 86
- Network Setup > PPPoE 87
- Dynamic DNS Settings 89
- Network Setup > Routes 90
- Masquerading 91
- Network Setup > SNAT 92
- Network Setup > DNAT 93
- DHCP Server 94
- Tracking 95
- System Update Server 96
- Virus Update Server 96
- Update Services 97
- System Update - Livelog 97
- Virus Update - Livelog 97
- Tracking > Backup 98
- CVS Settings 100
- Examples 100
- Packet Filters 101
- System Defined Rules 102
- Packet Filters > ICMP 103
- Packet Filters > Advanced 104
- Enable/Disable Logging 105
- VPN > IPSec 106
- Add an IKE Connection 107
- Add a Manual Connection 109
- VPN > x.509 Certificates 111
- VPN > IPSec Bridging 111
- VPN > PPTP 112
- PPTP Settings 113
- User Authentication 113
- Wizard Setup 114
- Packet Filter Rule 115
- Modem Settings 115
- Password Settings 115
- Save or Cancel 115
- Statistics & Logs 116
- Uptime 117
- Statistics and Logs 118
- Networks 118
- Network Connections 119
- Interfaces 120
- SMTP Proxy 121
- Self Monitor 123
- Packet Filter 125
- Port Scans 126
- HTTP Access 127
- Methods 130
- Authentication Setup 131
- Chapter 8 – Frequently Asked 133
- Questions (FAQs) 133
- Chapter 9 – Troubleshooting 139
- 1. Abstract 142
- II. Inbound Access Log 143
- III. Outbound Access Log 145
- VII. Admin Port Access Log 147
- VIII. Startup History Log 147
- IX. User Log 147
- X. Fragmented Dropped Log 147
- XI. ICMP Information 148
- What Is a Rescue Kernel? 149
- Before You Start 149
- ISO Image Directions 149
- External Server 150
- External FTP Server 151
- Software Add-ons, Overnight 153
- Replacement 153
- Top Cover Removal 154
- RF660VPN Processor Upgrade 154
- Software Add-ons 156
- CD-ROM Drive Adapter Pin Out 157
- Housekeeping 158
- Monitoring 158
- Updating 159
- Technical Support Contacts 161
- GNU GENERAL PUBLIC LICENSE 168
- ANY REMEDY HEREUNDER 172
- Support 173
- Limited Warranty 174
- Limitation of Liability 174
- Glossary 176
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