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Moxa DA-681-I-SP-LX [39/65] Filter table includes three chains
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DA-681 Linux Managing Communications
3-9
The DA-681-LX supports three types of IPTABLES: Filter tables, NAT tables, and Mangle tables.
Filter Table—includes three chains:
INPUT chain
OUTPUT chain
FORWARD chain
NAT Table—includes three chains:
PREROUTING chain—transfers the destination IP address (DNAT).
POSTROUTING chain—works after the routing process and before the Ethernet device process to transfer the
source IP address (SNAT).
OUTPUT chain—produces local packets.
Sub-tables
Source NAT (SNAT)—changes the first source packet IP address.
Destination NAT (DNAT)—changes the first destination packet IP address.
MASQUERADE—a special form for SNAT. If one host can connect to the Internet, then the other computers that
connect to this host can connect to the Internet when the computer does not have an actual IP address.
REDIRECT—a special form of DNAT that re-sends packets to a local host independent of the destination IP
address.
Mangle Table—includes two chains
PREROUTING chain—pre-processes packets before the routing process.
OUTPUT chain—processes packets after the routing process.
Mangle tables can have one of three extensions—TTL, MARK, TOS.
Содержание
- Da 681 series linux manual 1
- Fourth edition august 2012 1
- Www moxa com product 1
- Copyright notice 2
- Da 681 series linux manual 2
- Disclaimer 2
- Technical support contact information 2
- Trademarks 2
- Www moxa com support 2
- Introduction 4
- Attention 5
- Da 681 linux introduction 5
- Overview 5
- Product features 5
- Software specifications 5
- Attention 6
- Da 681 linux introduction 6
- Device driver 6
- Hardware 6
- Linux kernel 6
- Micro kernel 6
- Protocol stack 6
- Read only root file system 6
- Software components 6
- Da 681 linux introduction 7
- Da 681 linux introduction 8
- Da 681 linux introduction 9
- Da 681 linux introduction 10
- Da 681 linux introduction 11
- Software configuration 12
- Connecting from a telnet console 13
- Da 681 linux software configuration 13
- Starting from a vga console 13
- Attention 14
- Connecting from an ssh console 14
- Da 681 linux software configuration 14
- Adjusting the system time 15
- Da 681 linux software configuration 15
- Linux users 15
- Setting the time manually 15
- Windows users 15
- Attention 16
- Da 681 linux software configuration 16
- Ntp client 16
- Da 681 linux software configuration 17
- Updating the time automatically 17
- Da 681 linux software configuration 18
- Enabling and disabling daemons 18
- Da 681 linux software configuration 19
- Setting the run level 19
- Cron daemon for executing scheduled commands 20
- Da 681 linux software configuration 20
- Da 681 linux software configuration 21
- Inserting a sata hard drive into the computer 21
- Da 681 linux software configuration 22
- Inserting a usb storage device into the computer 22
- Attention 23
- Checking the linux version 23
- Da 681 linux software configuration 23
- Inserting a compactflash card into the computer 23
- Apt installing and removing packages 24
- Attention 24
- Da 681 linux software configuration 24
- Attention 25
- Da 681 linux software configuration 25
- Main swtd_fd open dev swtd o_rdwr time 4000 4000 ms ioctl swtd_fd ioctl_swatchdog_enable time while 1 25
- Wdt watchdog timer 25
- Da 681 linux software configuration 26
- Int swtd_disable int fd 26
- Int swtd_enable int fd unsigned long time 26
- Int swtd_get int fd int mode unsigned long time 26
- Int swtd_open void 26
- Ioctl swtd_fd ioctl_swatchdog_ack null close swtd_fd 26
- Close the file handle 27
- Managing communications 31
- Changing the interfaces configuration file 32
- Changing the network settings 32
- Da 681 linux managing communications 32
- Static ip address 32
- Adjusting ip addresses with ifconfig 33
- Da 681 linux managing communications 33
- Dynamic ip address using dhcp 33
- Enabling the telnet server 33
- Telnet server 33
- Da 681 linux managing communications 34
- Disabling the ftp server 34
- Disabling the telnet server 34
- Dns client 34
- Enabling the ftp server 34
- Ftp server 34
- Da 681 linux managing communications 35
- Etc hostname 35
- Etc nsswitch conf 35
- Etc resolv conf 35
- Apache web server 36
- Bin sh var www apache2 default cgi bin index cgi disable filename globbing set f echo content type text plain charset iso 8859 1 echo echo cgi 1 test script report echo echo argc is argv is echo echo server_software server_software echo server_name server_name echo gateway_interface gateway_interface echo server_protocol server_protocol echo server_port server_port echo request_method request_method echo http_accept http_accept echo path_info path_info echo path_translated path_translated echo script_name script_name echo query_string query_string echo remote_host remote_host 36
- Da 681 linux managing communications 36
- Default homepage 36
- Attention 37
- Da 681 linux managing communications 37
- Echo remote_addr remote_addr echo remote_user remote_user echo auth_type auth_type echo content_type content_type echo content_length content_length 37
- Saving web pages to a usb storage device 37
- Attention 38
- Da 681 linux managing communications 38
- Iptables 38
- Da 681 linux managing communications 39
- Filter table includes three chains 39
- Mangle table includes two chains 39
- Nat table includes three chains 39
- Sub tables 39
- Da 681 linux managing communications 40
- Iptables hierarchy 40
- Da 681 linux managing communications 41
- Iptables modules 41
- Observe and erase chain rules 41
- To maintain the database 41
- Append or delete rules 42
- Da 681 linux managing communications 42
- Define policy for chain rules 42
- Examples 42
- Attention 43
- Da 681 linux managing communications 43
- Examples 43
- Nat network address translation 43
- Da 681 linux managing communications 44
- Enabling nat at bootup 44
- Nat example 44
- Attention 45
- Connecting to a ppp server over a simple dial up connection 45
- Da 681 linux managing communications 45
- Ppp point to point protocol 45
- Checking the connection 46
- Connecting to a ppp server over a hard wired link 46
- Da 681 linux managing communications 46
- Da 681 linux managing communications 47
- Setting up a machine for incoming ppp connections 47
- Attention 48
- Da 681 linux managing communications 48
- Da 681 linux managing communications 49
- Da 681 linux managing communications 50
- Nfs network file system client 50
- Da 681 linux managing communications 51
- Snmp simple network management protocol 51
- Da 681 linux managing communications 52
- Ethernet bridging for private networks on different subnets 52
- Openvpn 52
- Attention 53
- Da 681 linux managing communications 53
- Da 681 linux managing communications 54
- Attention 55
- Da 681 linux managing communications 55
- Da 681 linux managing communications 56
- Ethernet bridging for private networks on the same subnet 56
- Routed ip 56
- Da 681 linux managing communications 57
- Da 681 linux managing communications 58
- System recovery 59
- Attention 60
- Bootable usb disk recovery 60
- Da 681 linux system recovery 60
- Da 681 lx 60
- Recovery environment 60
- Recovery procedure 60
- Usb port 60
- Da 681 linux system recovery 61
- Da 681 linux system recovery 62
- Da 681 linux system recovery 63
- Attention 64
- Da 681 linux system recovery 64
- Da 681 linux system recovery 65
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