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Moxa DA-682A-C7-W7E [36/112] User defined chains
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DA-682A Linux Softrware Managing Communications
3-19
User-Defined Chains
User-defined chains are used to create customized filters for a wide variety of needs; however, there are some
commonly used chains which most administrators call when building a firewall. One example follows:
moxa@Moxa:~# iptables –N TCP && iptables –N UDP
This creates a user-defned chain called TCP and another called UDP, which you may use to manage protocols
later on. To see how to implement these chains in the INPUT chain, see below, Rule Examples: Applying
User-Defined Chains.
ATTENTION
To find out what rules are currently written into each table and chain, use the commands described below, in
the section
Viewing and Manipulating Rulesets.
Understanding Basic Traffic Flows
Users should recognize that these five chains may be used to build three fundamental traffic flows. Additionally,
certain chains are only associated with certain tables. For more information on which tables use which chains,
see the next section,
A) Forwarded packets will traverse this set of chains in the following order:
PREROUTING FORWARD
POSTROUTING
(in the NAT table) (in the Filter table) (in the NAT table)
B) Inbound traffic that is destined for the local subnet will traverse this set of chains:
PREROUTING INPUT
INPUT
(in the NAT table)
(in the Mangle table)
(in the Filter table)
A) Outbound traffic that is leaving the firewall will traverse this set of chains:
OUTPUT OUTPUT
POSTROUTING
(in the NAT table) (in the Mangle table) (in the Filter table)
ATTENTION
Building complex firewalls using the Netfilter rules and interface can become overwhelming, even for
experienced administrators. If you require advanced firewall capabilities, Moxa recommends using a Netfilter
configuration interface. One o
f the easiest to learn and most powerful is the Shoreline Firewall, commonly
known as Shorewall
. Shorewall is available as a standard Debian package, and may be downloaded using
apt
-get. Shorewall documentation is available at the Shorewall website, found at
http://www.shorewall.net
.
Содержание
- Da 682a linux software manual 1
- First edition september 2013 1
- Www moxa com product 1
- Copyright notice 2
- Da 682a linux software manual 2
- Disclaimer 2
- Technical support contact information 2
- Trademarks 2
- Www moxa com support 2
- Table of contents 3
- Introduction 5
- Attention 6
- Device driver 6
- Hardware 6
- Linux kernel 6
- Micro kernel 6
- Overview 6
- Protocol stack 6
- Software specifications 6
- Software configuration 7
- Account management 8
- Connecting from an ssh console 9
- Starting from a vga console 9
- Windows users 9
- Are you sure you want to continue connection yes no yes_ 10
- Da 682a linux softrware software configuration 10
- Linux users 10
- Moxa moxa ssh 192 68 27 10
- Moxa moxa sudo hwclock w 10
- Moxa moxa sudo ntpdate time stdtime gov tw 10
- Ntp client 10
- Setting the system clock and the rtc 10
- User remotedebian moxa moxa ssh 192 68 27 the authenticity of host 192 68 27 192 68 27 can t be established rsa key fingerprint is 8b ee ff 84 41 25 fc cd 2a f2 92 8f cb 1f 6b 2f 10
- Attention 11
- Bin sh ntpdate time stdtime gov tw you can use the time server s ip address or domain name directly if you use domain name you must enable the domain client on the system by updating etc resolv conf file hwclock w sleep 100 11
- Da 682a linux softrware software configuration 11
- Date sudo hwclock wed dec 16 03 51 07 cst 2009 wed 16 dec 2009 03 51 07 am cst 0 16771 seconds 11
- Etc init 11
- Etc init d fixtime s 11
- Fixtime s 11
- How to run a shell script automatically across re boots 11
- Http www ntp or 11
- Moxa moxa chmod 755 fixtime sh 11
- Moxa moxa date sudo hwclock wed dec 16 16 36 12 cst 2009 wed 16 dec 2009 03 38 13 am cst 0 16751 seconds 11
- Moxa moxa vi etc inittab 11
- Ntp 2345 respawn etc init d fixtime sh 11
- Sample shell script for scheduled clock synchronizations 11
- Sudo hwclock w 11
- Sudo ntpdate time stdtime gov tw 16 dec 03 49 48 ntpdate2510 step time server 220 30 58 2 offset 155905087 84256 sec 11
- Updates every 100 seconds the min time is 100 seconds change 100 to a larger number to update the rtc less often 11
- Using a shell script for automatic updates 11
- Enabling and disabling daemons 12
- Setting a time manually 12
- Setting the rtc 12
- System time 12
- Attention 13
- Bin sh begin init info provides tcps2 required start required stop default start 2 3 4 5 default stop 0 1 6 short description tcps2 end init info lib lsb init functions export path path path usr sbin sbin case 1 in 13
- Da 682a linux softrware software configuration 13
- Default 97 03 13
- Etc init d 13
- Etc init d skeleto 13
- Managing services with insserv 13
- Rc scriptname 13
- Usr sbi 13
- Warning 13
- 8 root hwclock w 14
- Cron for executing scheduled commands 14
- Da 682a linux softrware software configuration 14
- Etc cronta 14
- Fixtime s 14
- Init d tcps2 14
- Minute hour dom date month dow user command 14
- Moxa moxa insserv r tcps2 14
- Moxa moxa ls l etc rc d tcps ls cannot access etc rc d tcps no such file or directory 14
- Moxa moxa sudo insserv v d tcps2 14
- Start start stop daemon start quiet oknodo pidfile var run tcps2 pid exec usr sbin tcps2 stop start stop daemon stop quiet oknodo pidfile var run tcps2 pid esac exit 0 14
- 10 root home fixtime sh 15
- Attention 15
- Bin sh ntpdate time stdtime gov tw hwclock w exit 0 15
- Da 682a linux softrware software configuration 15
- Dev sd 15
- Dev sdb1 media cf1 ext4 noatime errors remount ro 0 0 15
- Disconnecting a usb storage device 15
- Etc fsta 15
- Fixtime s 15
- Media usb 15
- Mount dev sdd1 on media usb0 type vfat rw nodev noexec noatime nodiratime sync fmask 0022 dmask 0022 codepage cp437 io charset utf8 shortname mixed errors remount ro 15
- Mounting a cf card 15
- Mounting a usb storage device 15
- Moxa moxa chmod 755 fixtime sh 15
- Moxa moxa syn 15
- Root moxa moxa umount f media usb0 15
- Attention 16
- Checking versions for your kernel and os 16
- Cleaning out the package cache 16
- Using apt to install and remove software 16
- Determining available drive space 17
- Managing communications 18
- Da 682a linux softrware managing communications 19
- Attention 20
- Configuring a persistent network interface naming order 20
- Configuring network interfaces 20
- Da 682a linux softrware managing communications 21
- Dynamic ip address using dhcp 21
- Etc networ 21
- Etc network interfaces 21
- Etc network sudo vi interfaces 21
- Etc networking interface 21
- Ethernet interface configuration 21
- Static ip address 21
- Sudo service networking restart 21
- The loopback network interface auto lo iface lo inet loopback the primary network interface auto eth0 iface eth0 inet dhcp address 192 68 27 netmask 255 55 55 broadcast 192 68 55 21
- The loopback network interface auto lo iface lo inet loopback the primary network interface auto eth0 iface eth0 inet static address 192 68 27 netmask 255 55 55 broadcast 192 68 55 auto eth1 iface eth1 inet static address 192 68 27 netmask 255 55 55 broadcast 192 68 55 21
- Adjusting ip addresses with ifconfig 22
- Da 682a linux softrware managing communications 22
- Etc network interface 22
- Point to point over ethernet pppoe configuration 22
- Pppoeconf 22
- Sudo ifconfig eth0 192 68 22
- The easy way pppoeconf 22
- Da 682a linux softrware managing communications 23
- Etc resolve con 23
- The difficult way manually 24
- Attention 25
- Cat etc resolv conf resolv conf this file is the resolver configuration file see resolver 5 nameserver 168 5 nameserver 139 75 0 0 etc 25
- Configuring a point to point connection 25
- Da 682a linux softrware managing communications 25
- Etc ppp options eth0 5 lines 67 characters 25
- Moxa moxa ifconfig ppp 25
- Moxa moxa kill 9 pppd 25
- Moxa moxa pppd eth0 25
- Nameserver 168 5 nameserver 139 75 0 0 25
- Nameserver ip_addr_of_first_dns_server nameserver ip_addr_of_second_dns_server 25
- Connecting to a ppp server over a hardwired link 26
- Da 682a linux softrware managing communications 26
- Moxa moxa pppd connect chat v atdt5551212 connect login username password password dev ttym0 115200 debug crtscts modem defaultroute 192 7 26
- Moxa moxa pppd connect chat v atdt5551212 connect user username password password dev ttym0 115200 crtscts modem 26
- Moxa moxa pppd connect chat v noipdefault dev ttym0 19200 crtscts 26
- Checking the connection 27
- Attention 28
- Method 1 pppd dial in with pppd commands 28
- Method 2 pppd dial in with pppd script 28
- Setting up a machine for incoming ppp connections 28
- Configuring the os hostname 29
- Da 682a linux softrware managing communications 29
- Disabling a telnet ftp tftp server 29
- Dns utilities 29
- Enabling a telnet ftp or tftp server 29
- Etc hostnam 29
- Etc hostname 29
- Etc inetd con 29
- Etc nsswitch con 29
- Etc resolv con 29
- Sudo etc init d hostname sh start 29
- Sudo service openbsd inetd restart 29
- Telnet ftp tftp server 29
- Telnet stream tcp nowait telnetd usr sbin tcpd usr sbin in telnetd ftp stream tcp nowait root usr sbin tcpd usr sbin proftpd 29
- Tftp dgram udp wait nobody usr sbin tcpd usr sbin in tftpd srv tftp 29
- Configuring the dns resolver 30
- Configuring the name service switcher 30
- Da 682a linux softrware managing communications 30
- Etc cat resolv conf resolv conf this file is the resolver configuration file see resolver 5 nameserver 192 68 6 nameserver 140 15 1 nameserver 140 15 36 0 nameserver 168 5 30
- Etc nsswitch conf example configuration of gnu name service switch functionality if you have the glibc doc reference and info packages installed try info libc name service switch for information about this file passwd compat group compat shadow compat hosts files dns networks files protocols db files 30
- Etc resolv con 30
- Hostname your preferred hostname 30
- Moxa moxa ntpdate time stdtime gov tw 30
- Resolv conf 30
- Services db files ethers db files rpc db files 30
- Apache web server 31
- Attention 31
- Configuring the common gateway interface cgi 31
- Default homepage 31
- Disabling cgi 31
- Setting up cgi 31
- Allowoverride none options execcgi multiviews symlinksifownermatch order allow deny allow from all 32
- Attention 32
- Da 682a linux softrware managing communications 32
- Etc apache2 sites available defaul 32
- Etc sudo vi etc apache2 sites avaliable default 32
- Media usb 32
- Moxa moxa sudo mount 32
- Saving web pages to a usb storage device 32
- Sudo service apache2 restart 32
- Var ww 32
- Attention 33
- Da 682a linux softrware managing communications 33
- Etc sudo vi etc apache2 sites avaliable default ssl 33
- Moxa moxa cd etc init d apache2 restart 33
- Netfilter iptables 33
- Attention 34
- Building the firewall writing filter rules 34
- Da 682a linux softrware managing communications 34
- Ip tables and ip chains 34
- Overview of basic netfilter architecture 34
- Setting up nat 34
- The nat table 34
- Da 682a linux softrware managing communications 35
- The filter table 35
- The five built in rule chains 35
- The mangle table 35
- Attention 36
- Da 682a linux softrware managing communications 36
- Moxa moxa iptables n tcp iptables n udp 36
- Understanding basic traffic flows 36
- User defined chains 36
- Attention 37
- Da 682a linux softrware managing communications 37
- Netfilter hierarchy for incoming packets 37
- Command arguments 38
- Connection tracking 38
- Da 682a linux softrware managing communications 38
- Moxa moxa iptables t tables p policy chain target policy accept drop etc 38
- Moxa moxa sbin service iptables save 38
- Policies setting default firewall behavior 38
- Setting firewall policies 38
- Warning 38
- Da 682a linux softrware managing communications 39
- Moxa moxa iptables p forward drop 39
- Moxa moxa iptables p input drop 39
- Moxa moxa iptables p output accept 39
- Moxa moxa iptables t nat p output accept 39
- Moxa moxa iptables t nat p postrouting accept 39
- Moxa moxa iptables t nat p prerouting accept 39
- Netfilter policy examples 39
- Policy arguments 39
- Viewing and manipulating rulesets 39
- Da 682a linux softrware managing communications 40
- Delete a user generated chain 40
- Etc sysconfig iptables sav 40
- Flush a current rule chain or delete a user specified chain 40
- List current rule chains for a target table or for all tables 40
- Moxa iptables l z n chain rulenum 40
- Moxa iptables t table or multiple tables l chain n 40
- Moxa iptables t table or tables fxz 40
- Moxa iptables x chain 40
- Moxa moxa iptables 40
- Moxa moxa sbin service iptables save 40
- Warning 40
- Zero out the packet and byte counters for a rule chain 40
- Da 682a linux softrware managing communications 41
- Examples 41
- Iptables a input i lo j accept 41
- Iptables a input m conntrack ctstate invalid j drop 41
- Iptables a input m conntrack ctstate related established j accept 41
- Iptables a input p tcp dport 22 j accept 41
- Iptables a input p tcp dport 443 j accept 41
- Iptables a input p tcp dport 80 j accept 41
- Iptables a input p udp dport 53 j accept 41
- Moxa iptables t table ai input output forward io interface p tcp udp icmp all s ip network sport ports d ip network dport ports j accept drop 41
- Moxa moxa iptables a input i lo j accept 41
- Warning 41
- Writing rulechains 41
- Attention 42
- Da 682a linux softrware managing communications 42
- Etc modprobe conf 42
- Iptables a input i eth0 p all m mac mac source 01 02 03 04 05 06 j drop 42
- Iptables a input i eth0 p all m mac mac source 02 03 04 05 06 07 j accept 42
- Iptables a input i eth0 p tcp dport 21 j accept 42
- Iptables a input i eth0 p tcp dport 25 j log 42
- Iptables a input i eth0 p tcp s 192 68 24 j accept 42
- Iptables a input i eth0 p tcp s 192 68 4 dport 137 139 j accept 42
- Iptables a input i eth0 p tcp s 192 68 5 j drop 42
- Iptables a input i eth0 p tcp s 192 68 j accept 42
- Iptables a input p 41 j accept 42
- Iptables a input p udp m conntrack ctstate new j udp iptables a input p tcp syn m conntrack ctstate new j tcp 42
- Iptables a tcp p tcp dport 80 j accept iptables a tcp p tcp dport 443 j accept iptables a tcp p tcp dport 22 j accept iptables a udp p udp dport 53 j accept 42
- Moxa moxa modprobe ipt_mac 42
- Rule examples applying user defined chains 42
- To make a module load across reboots you may add it to the etc modprobe conf file using this command 42
- Which is overwrite 42
- Attention 43
- Da 682a linux softrware managing communications 43
- Enabling nat masquerading 43
- Etc sysconfig iptables moxa moxa sbin service iptables save 43
- Ip tables nat policies 43
- Iptables t nat p prerouting accept iptables t nat p postrouting accept iptables t nat p output accept 43
- Moxa moxa modprobe ipt_masquerade 43
- Nat network address translation 43
- Saving the firewall 43
- Source nat snat and destination nat dnat 43
- Attention 44
- Da 682a linux softrware managing communications 44
- Etc fsta 44
- Etc modprobe conf 44
- Iptables t nat a postrouting o eth0 s 555 66 77 88 24 j masquerade 44
- Moxa moxa mkdir p home nfs public 44
- Moxa moxa mount t nfs o nolock 192 68 home public home nfs public 44
- Moxa moxa showmount e host 44
- Proc sys net ipv4 ip_forward 44
- Setting up a networked file system nfs 44
- Setting up a vpn 44
- Attention 45
- Configuring openvpn a 45
- Da 682a linux softrware managing communications 45
- Dev tap0 port 1194 secret etc openvpn secrouter key 45
- Etc openvpn secrouter ke 45
- Etc openvpn tap0 br con 45
- Ethernet bridges linking indepdent subnets over the internet 45
- Moxa moxa 45
- Moxa moxa openvpn genkey secret secrouter key 45
- Moxa moxa scp etc openvpn secrouter key xxx xxx x xxx etc openvpn 45
- Point to the peer remote 192 68 74 45
- Configuring openvpn b 46
- Da 682a linux softrware managing communications 48
- Etc openvpn tap0 br con 48
- Ethernet bridging for private networks on the same subnet 48
- Point to the peer remote 192 68 74 dev tap0 secret etc openvpn secrouter key cipher des ede3 cbc auth md5 tun mtu 1500 tun mtu extra 64 ping 40 up etc openvpn tap0 br sh comp lzo 48
- Routed ip tunnels 48
- File overview 50
- Hot swap daemon customization 50
- Setting up hot swap for block storage 50
- Da 682a linux softrware managing communications 51
- Disk n p 51
- Etc init d mxhtspd s 51
- Etc mxhtspd mxhtspd con 51
- Handling an event with mxhtspd moxa hot swap daemon 51
- Media disk n p 51
- Media disk1p 51
- Mount point usage limit media disk2p1 90 media disk1p1 90 51
- Moxa moxa mount rootfs on type rootfs rw none on sys type sysfs rw nosuid nodev noexec relatime none on proc type proc rw nosuid nodev noexec relatime udev on dev type tmpfs rw relatime size 10240k mode 755 dev hda1 on type ext2 ro relatime errors remount ro tmpfs on lib init rw type tmpfs rw nosuid relatime mode 755 usbfs on proc bus usb type usbfs rw nosuid nodev noexec relatime tmpfs on dev shm type tmpfs rw nosuid nodev relatime 51
- Start echo starting mxhtspd daemon sleep 1 mxhtspd v 51
- Da 682a linux softrware managing communications 52
- Devpts on dev pts type devpts rw nosuid noexec relatime gid 5 mode 620 ptmxmode 000 none on tmp type tmpfs rw relatime dev hda2 on home type ext2 rw relatime errors continue dev sda1 on media disk2p1 type ext3 rw relatime errors continue data ordered dev sda2 on media disk2p2 type ext3 rw relatime errors continue data ordered dev sdb1 on media disk1p1 type ext3 rw relatime errors continue data ordered dev sdb2 on media disk1p2 type ext3 rw relatime errors continue data ordered 52
- Etc initta 52
- Etc mxhtspd action btn presse 52
- Etc mxhtspd action disk unplugge 52
- Etc mxhtspd action part over usag 52
- Etc mxhtspd mxhtspd con 52
- Media disknp 52
- Moxa moxa sudo runlevel n 2 52
- Setting up hot swap daemon logging 52
- Warning 52
- A sample mxhtspd setup 53
- Add parameter if necessary mxhtspd l 3 53
- Attention 53
- Bin sh file basename 0 num 1 add your commands here home log_application echo file button num is pressed 53
- Da 682a linux softrware managing communications 53
- Etc init d mxhtspd s 53
- Moxa etc rc2 d mv n10rsyslog s10rsyslog 53
- The default runlevel id 2 initdefault 53
- Uncomment below lines for mxhtspd with local 0 daemon var log mxhtspd log 53
- Bin sh file basename 0 num 1 add your commands here kill 9 pidof x log_application internal operation mxhtspd remove disk num 54
- Da 682a linux softrware managing communications 54
- Dev ttyacm 54
- Moxa moxa apt get install gps 54
- Moxa moxa cat dev ttyacm0 gpgsv 1 1 04 24 28 123 37 21 09 054 31 19 52 213 23 47 270 74 gpgga 061824 2458 35139 n 12133 55835 e 1 05 19 103 m 14 gprmc 061824 a 2458 35139 n 12133 55835 e 290710 a 68 gpgsa a 3 24 21 06 31 16 25 19 18 29 gpvtg t m 0 n 0 k 4e 54
- Moxa moxa killall cat 54
- Retrieving gps data 54
- Setting up gps 54
- Awk f gpgga print strftime y m d 2 substr 3 0 2 substr 3 3 60 4 substr 5 0 3 substr 5 4 60 6 10 fflush dev ttyacm0 55
- Da 682a linux softrware managing communications 55
- Etc default gps 55
- Moxa apt get install gpsd clients 55
- Moxa moxa cgps 55
- Moxa moxa dpkg reconfigure gpsd 55
- Moxa moxa sudo etc init d gpsd start 55
- Programming guide 57
- Desktop management interface dmi 58
- Programmable leds 58
- Rtc real time clock 58
- Da 682a linux softrware programming guide 59
- Dev pled 59
- Dev sata_pled 59
- Dev sata_pled1 59
- How the wdt works 59
- Introduction 59
- Moxa moxa 59
- Moxa moxal update rc 59
- Turning on or off the leds 59
- Turning on or off the leds on a sata board 59
- Watch dog timer wdt 59
- Da 682a linux softrware programming guide 60
- Etc watchdog con 60
- Init d watchdog 60
- The watchdog device ioctl commands 60
- Watchdog device dev watchdog interval 60 realtime yes priority 10 60
- Da 682a linux softrware programming guide 61
- Example hotswa 61
- Examples 61
- Hot swapping block drives 61
- Int main void int fd open dev watchdog o_wronly int ret 0 if fd 1 perror watchdog exit exit_failure while 1 ret write fd 0 1 if ret 1 ret 1 break sleep 10 close fd return ret 61
- Da 682a linux softrware programming guide 62
- Documentation format 62
- Function documentation 62
- Attention 63
- Examples 63
- Function documentation 63
- Moxa safeguard 63
- Programming optional modules 65
- Configuring serial port mode 66
- Da 682a linux softrware programming optional modules 66
- Moxa moxa ls al dev ttym crw rw t 1 root dialout 30 0 aug 14 13 37 dev ttym0 crw rw t 1 root dialout 30 1 aug 14 13 37 dev ttym1 crw rw t 1 root dialout 30 10 aug 14 13 37 dev ttym10 crw rw t 1 root dialout 30 11 aug 14 13 37 dev ttym11 crw rw t 1 root dialout 30 12 aug 14 13 37 dev ttym12 crw rw t 1 root dialout 30 13 aug 14 13 37 dev ttym13 crw rw t 1 root dialout 30 14 aug 14 13 37 dev ttym14 crw rw t 1 root dialout 30 15 aug 14 13 37 dev ttym15 crw rw t 1 root dialout 30 2 aug 14 13 37 dev ttym2 crw rw t 1 root dialout 30 3 aug 14 13 37 dev ttym3 crw rw t 1 root dialout 30 4 aug 14 13 37 dev ttym4 crw rw t 1 root dialout 30 5 aug 14 13 37 dev ttym5 crw rw t 1 root dialout 30 6 aug 14 13 37 dev ttym6 crw rw t 1 root dialout 30 7 aug 14 13 37 dev ttym7 crw rw t 1 root dialout 30 8 aug 14 13 37 dev ttym8 crw rw t 1 root dialout 30 9 aug 14 13 37 dev ttym9 66
- Moxa moxa setinterface dev ttym0 now setting is rs485 2wires interface 66
- Programming serial modules 66
- Attention 67
- Loading the defaults 67
- Programming the lan module 67
- Da 682a linux softrware programming optional modules 68
- Programming the fiber module 68
- Programming the swtich module 68
- Da 682a linux softrware programming optional modules 69
- Programming the pci module 69
- System recovery 70
- Da 682a linux softrware system recovery 71
- Overview setting up the recovery environment 71
- Recovery da 682a lx_recovery clonezill 71
- Step 1 prepare the usb drive 71
- Tuxboot windows 23 ex 71
- Da 682a linux softrware system recovery 72
- Two types of recovery base install and fully configured 72
- Attention 73
- Da 682a linux softrware system recovery 73
- Media cd0 recovery os_imag 73
- Media usb0 home partima 73
- Moxa moxa cp media cd0 recovery os_image media usb0 home partimag 73
- Step 2 opt recovering to a stock os 73
- Step 3 setting the bios to boot via usb 73
- Da 682a linux softrware system recovery 74
- F home partimag 74
- Step 4 opt create a custom system image 74
- Da 682a linux softrware system recovery 75
- Home partima 75
- Warning 75
- Da 682a linux softrware system recovery 76
- Step 5 performing a system recovery 76
- Da 682a linux softrware system recovery 77
- Da 682a linux softrware system recovery 78
- Step 6 reset the bios to its original state 78
- Da 682a linux softrware system recovery 79
- A linux software components 80
- Linux software components 80
- Da 682a linux softrware linux software components 81
- Da 682a linux softrware linux software components 82
- Da 682a linux softrware linux software components 83
- Da 682a linux softrware linux software components 84
- Da 682a linux softrware linux software components 85
- Da 682a linux softrware linux software components 86
- Da 682a linux softrware linux software components 87
- Da 682a linux softrware linux software components 88
- Da 682a linux softrware linux software components 89
- B the moxa custom mib file 90
- The moxa custom mib file 90
- C sample scripts firewall rules 109
- Sample scripts firewall rules 109
- A sample initialization script 110
- Da 682a linux softrware sample scripts firewall rules 110
- Da 682a linux softrware sample scripts firewall rules 111
- A sample firewall 112
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