Как заставить Linux перезагрузиться при возникновении panic ошибки?

Для этого достаточно задать параметр kernel.panic в файле /etc/sysctl.conf и применить изменения. При установке данного параметра в нулевое значение перезагрузки при panic происходить не будет, при установке в любое положительное значение (строго больше нуля) будет происходить перезагрузка через заданное количество секунд.

Итого, добавляем в файл /etc/sysctl.conf строку

kernel.panic = 15

После этого применяем изменения:

sysctl -p

Secret MIB's & Secret way to upgrade cable modem via BITFILE

The following text was compiled by

Dshocker (of TCNISO)

Look down at the bottom you will see secret MIB's for the modems.

Like getting and setting your modem cert... Dshocker

Well here it is everything you will need for you're modem

You can upgrade modem firmware do what ever, Read the Read me.

Under this text because if you don't I will not help you.

Hope you have fun

Dshocker

PS: for each modem if you wanna use it on Sb5100.

You name the bitfile SB5100.bit SB4100, SB4100.bit, SBG900,

SBG900.bit etc...

Officially Released by Dshocker

18a. Factory Mode

Before I talk about bit files I should explain what factory mode is:

Factory mode, when enabled, gives you access via SNMP to the factory MIB.

The factory MIB is a list of OID's, each OID having a unique function.

Here is a very small list of things you can do remote via SNMP when in, factory mode,

" get/set the HFC, Ethernet and USB MAC addresses.

" get/set the modem serial number.

" get/set the modem cert.'s (cm, vendor, and secure code).

" ping IP address'.

" execute shell commands

" execute injected code (see cmFactoryBCMGroup 'CommandType, AddressOrOpcode, ByteCount and Data')

18b. Bit Files

The bit file method works on firmware 0.4.5.0 and up on SB3100, SB4100, SB4101

And, SB4200.

And on any SB5100, SB5101 and SBG900.

The bitfile method works like this.

1) Using SNMP you set the OID 1.3.6.1.4.1.1166.1.19.3.1.18.0 to the interger.

The value of your HFC MAC address. (Calc.exe)

2) The modem then TFTP gets a 'bitfile' from 192.168.100.10

4100 modem will TFTP get SB4100.bit, and 4200 modem will TFTP get SB4200.bit

3) If the bit file is the correct size and contains the exact sequence of, bytes, then factory mode is enabled and the modem reboots!

4) When the modem reboots you have full access to all the factory MIB and OID's, within it.

NOTE: Factory mode will stay enabled until you turn it off by setting

1.3.6.1.4.1.1166.1.19.4.29.0 to integer 1 and reboot the modem!

Sorry no source code for you :P - a compiled bitfile is in the rar.

18c. Enable Factory MIB

This tutorial will show you how to enable the factory MIB on a modem and change the

MAC and serial, via SNMP

1) Put the .bit file into your TFTP server's directory.

2) Use SNMP to set the OID 1.3.6.1.4.1.1166.1.19.3.1.18.0 to the decimal of your HFC MAC address

Example: snmpset -v2c -c public 192.168.100.1 1.3.6.1.4.1.1166.1.19.3.1.18.0 i

12345678

The modem will now get the bit file and if it's correct it will enable factory mode and reboot!

Once the modem is rebooted....

3) You can now set the OID 1.3.6.1.4.1.1166.1.19.4.3.0 to your NEW ETHERNET MAC address

Example: snmpset -v2c -c public 192.168.100.1 1.3.6.1.4.1.1166.1.19.4.3.0 s

"12:34:56:78:9a:00"

4) You can now set the OID 1.3.6.1.4.1.1166.1.19.4.4.0 to your NEW HFC MAC address.

Example: snmpset -v2c -c public 192.168.100.1 1.3.6.1.4.1.1166.1.19.4.4.0 s

"12:34:56:78:9a:0a"

5) You can now set the OID 1.3.6.1.4.1.1166.1.19.4.6.0 to your NEW SERIAL NUMBER.

Example: snmpset -v2c -c public 192.168.100.1 1.3.6.1.4.1.1166.1.19.4.6.0 s

"12345678901234567890"

6) To finish up disable the factory MIB by setting the OID

1.3.6.1.4.1.1166.1.19.4.29.0 to int 1

Example: snmpset -v2c -c public 192.168.100.1 1.3.6.1.4.1.1166.1.19.4.29.0 i

Now reboot your modem and all is done.

18d. Factory mode OID list for Motorola cable modems

AKA FACTORY MIB's for Factory mode

This list is generic among Motorola cable modems

SB3100, SB4100, SB4101, SB4200, SB4220, SB5100, SB5101, SBG900 and probably more, HOWEVER some OID's will not exist on some modems, E.g. (cmFactoryBCMGroup oid's)

To execute code, only exist in SB5100, SB5101 and SBG900)

cmPrivateArpFilterGroup

1.3.6.1.4.1.1166.1.19.2

1.3.6.1.4.1.1166.1.19.2.1.0 cmArpFilterEnabled

1.3.6.1.4.1.1166.1.19.2.2.0 cmArpFilterInterval

1.3.6.1.4.1.1166.1.19.2.3.0 cmArpFilterLimit

1.3.6.1.4.1.1166.1.19.2.4.0 cmArpFilterInArps

1.3.6.1.4.1.1166.1.19.2.5.0 cmArpFilterOutArps

1.3.6.1.4.1.1166.1.19.2.6.0 cmArpFilterInArpsThisFilter

cmConfigPrivateBaseGroup

1.3.6.1.4.1.1166.1.19.3

cmConfigFreqObjectsGroup

1.3.6.1.4.1.1166.1.19.3.1

1.3.6.1.4.1.1166.1.19.3.1.1.0 cmConfigFreq1

1.3.6.1.4.1.1166.1.19.3.1.2.0 cmConfigFreq2

1.3.6.1.4.1.1166.1.19.3.1.3.0 cmConfigFreq3

1.3.6.1.4.1.1166.1.19.3.1.8.0 cmFreqPlanType

1.3.6.1.4.1.1166.1.19.3.1.11.0 cmUpstreamChannelId1

1.3.6.1.4.1.1166.1.19.3.1.12.0 cmCarrierFrequencyOffset

1.3.6.1.4.1.1166.1.19.3.1.14.0 cmSnmpHFCPort

1.3.6.1.4.1.1166.1.19.3.1.15.0 cmSnmpHFCTrapPort

1.3.6.1.4.1.1166.1.19.3.1.17.0 cmSnmpDisplayHtml

1.3.6.1.4.1.1166.1.19.3.1.18.0 cmResetToDefaults

1.3.6.1.4.1.1166.1.19.3.1.19.0 cmStandbyMode

1.3.6.1.4.1.1166.1.19.3.1.20.0 cmHybridMode

1.3.6.1.4.1.1166.1.19.3.1.21.0 cmUpstreamChannelId3

1.3.6.1.4.1.1166.1.19.3.1.22.0 cmUpstreamPower1

1.3.6.1.4.1.1166.1.19.3.1.23.0 cmUpstreamPower2

1.3.6.1.4.1.1166.1.19.3.1.24.0 cmUpstreamPower3

1.3.6.1.4.1.1166.1.19.3.1.25.0 cmDocsis20Capable

1.3.6.1.4.1.1166.1.19.3.1.26.0 cmUpstreamChannelId2

cmPrivateFactoryGroup

1.3.6.1.4.1.1166.1.19.4

1.3.6.1.4.1.1166.1.19.4.1.0 cmFactoryVersion

1.3.6.1.4.1.1166.1.19.4.2.0 cmFactoryDbgBootEnable

1.3.6.1.4.1.1166.1.19.4.3.0 cmFactoryEnetMacAddr

1.3.6.1.4.1.1166.1.19.4.4.0 cmFactoryHfcMacAddr

1.3.6.1.4.1.1166.1.19.4.6.0 cmFactorySerialNumber

1.3.6.1.4.1.1166.1.19.4.9.0 cmFactoryClearFreq1

1.3.6.1.4.1.1166.1.19.4.10.0 cmFactoryClearFreq2

1.3.6.1.4.1.1166.1.19.4.11.0 cmFactoryClearFreq3

1.3.6.1.4.1.1166.1.19.4.12.0 cmFactorySetReset

1.3.6.1.4.1.1166.1.19.4.13.0 cmFactoryClrConfigAndLog

1.3.6.1.4.1.1166.1.19.4.14.0 cmFactoryPingIpAddr

1.3.6.1.4.1.1166.1.19.4.15.0 cmFactoryPingNumPkts

1.3.6.1.4.1.1166.1.19.4.16.0 cmFactoryPingNow

1.3.6.1.4.1.1166.1.19.4.17.0 cmFactoryPingCount

1.3.6.1.4.1.1166.1.19.4.28.0 cmFactoryCliFlag

1.3.6.1.4.1.1166.1.19.4.29.0 cmFactoryDisableMib

1.3.6.1.4.1.1166.1.19.4.30.0 cmFactoryUpstreamPowerCalibration1

1.3.6.1.4.1.1166.1.19.4.50.0 cmFactoryBigRSAPublicKey

1.3.6.1.4.1.1166.1.19.4.51.0 cmFactoryBigRSAPrivateKey

1.3.6.1.4.1.1166.1.19.4.52.0 cmFactoryCMCertificate

1.3.6.1.4.1.1166.1.19.4.53.0 cmFactoryManCertificate

1.3.6.1.4.1.1166.1.19.4.54.0 cmFactoryRootPublicKey

1.3.6.1.4.1.1166.1.19.4.55.0 cmFactoryCodeSigningTime

1.3.6.1.4.1.1166.1.19.4.56.0 cmFactoryCVCValidityStartTime

1.3.6.1.4.1.1166.1.19.4.58.0 cmFactoryCMManufacturerName

1.3.6.1.4.1.1166.1.19.4.59.0 cmFactoryHtmlReadOnly

1.3.6.1.4.1.1166.1.19.4.60.0 cmFactoryCmUsbMacAddr

1.3.6.1.4.1.1166.1.19.4.61.0 cmFactoryCpeUsbMacAddr

1.3.6.1.4.1.1166.1.19.4.62.0 cmFactoryCmAuxMacAddr

1.3.6.1.4.1.1166.1.19.4.63.0 cmFactoryTunerId

1.3.6.1.4.1.1166.1.19.4.64.0 cmFactoryHwRevision

1.3.6.1.4.1.1166.1.19.4.65.0 cmFactoryUsAmpId

1.3.6.1.4.1.1166.1.19.4.66.0 cmFactory80211RegDomain

1.3.6.1.4.1.1166.1.19.4.67.0 cmFactoryResidentialGatewayEnable

1.3.6.1.4.1.1166.1.19.4.70.0 cmFactoryFWFeatureID

1.3.6.1.4.1.1166.1.19.4.90.0 cmFactorySwServer

1.3.6.1.4.1.1166.1.19.4.91.0 cmFactorySwFilename

1.3.6.1.4.1.1166.1.19.4.92.0 cmFactorySwDownloadNow

1.3.6.1.4.1.1166.1.19.4.93.0 cmFactoryGwAppPublicKey

1.3.6.1.4.1.1166.1.19.4.94.0 cmFactoryGwAppPrivateKey

1.3.6.1.4.1.1166.1.19.4.95.0 cmFactoryGwAppRootPublicKey

1.3.6.1.4.1.1166.1.19.4.31 cmFactoryDownstreamCalibrationGroup

1.3.6.1.4.1.1166.1.19.4.31.1.0 cmFactorySuspendStartup

1.3.6.1.4.1.1166.1.19.4.31.2.0 cmFactoryDownstreamFrequency

1.3.6.1.4.1.1166.1.19.4.31.3.0 cmFactoryDownstreamAcquire

1.3.6.1.4.1.1166.1.19.4.31.4.0 cmFactoryTunerAGC

1.3.6.1.4.1.1166.1.19.4.31.5.0 cmFactoryIfAGC

1.3.6.1.4.1.1166.1.19.4.31.6.0 cmFactoryQamLock

1.3.6.1.4.1.1166.1.19.4.31.7.0 cmFactoryDownstreamCalibrationTableMaxSum

1.3.6.1.4.1.1166.1.19.4.31.8.0 cmFactoryDownstreamCalibrationTableMinSum

1.3.6.1.4.1.1166.1.19.4.31.9.0 cmFactoryTop

1.3.6.1.4.1.1166.1.19.4.31.10.0 cmFactoryDownstreamCalibrationOffset

1.3.6.1.4.1.1166.1.19.4.31.100 cmFactoryCalibrationEntry

1.3.6.1.4.1.1166.1.19.4.31.100.1.1 cmFrequencyCalibrationIndex

1.3.6.1.4.1.1166.1.19.4.31.100.1.2 cmFactoryCalibrationFrequencyData

cmFactoryBCMGroup

1.3.6.1.4.1.1166.1.19.4.32

1.3.6.1.4.1.1166.1.19.4.32.1.0 cmFactoryBCMCommandType

1.3.6.1.4.1.1166.1.19.4.32.2.0 cmFactoryBCMAddressOrOpcode

1.3.6.1.4.1.1166.1.19.4.32.3.0 cmFactoryBCMByteCount

1.3.6.1.4.1.1166.1.19.4.32.4.0 cmFactoryBCMData

cmRegPrivateGroup

1.3.6.1.4.1.1166.1.19.5

cmStatsGroup

1.3.6.1.4.1.1166.1.19.9

cmStatsObjectsGroup

1.3.6.1.4.1.1166.1.19.9.1

1.3.6.1.4.1.1166.1.19.9.1.5.0 cmResetIfCmStatusCounters

1.3.6.1.4.1.1166.1.19.9.1.6.0 cmResetCMSignalQualityCounters

1.3.6.1.4.1.1166.1.19.9.1.7.0 cmQam256PowerFactorTableVersion

cmTftpConfigPrivateGroup

1.3.6.1.4.1.1166.1.19.6

1.3.6.1.4.1.1166.1.19.6.1

1.3.6.1.4.1.1166.1.19.6.1.1.1 cmCfgClassId

1.3.6.1.4.1.1166.1.19.6.1.1.2 cmCfgMaxDsRate

1.3.6.1.4.1.1166.1.19.6.1.1.3 cmCfgMaxUsRate

1.3.6.1.4.1.1166.1.19.6.1.1.4 cmCfgUsChannelPriority

1.3.6.1.4.1.1166.1.19.6.1.1.5 cmCfgMinUsDataRate

1.3.6.1.4.1.1166.1.19.6.1.1.6 cmCfgMaxUsChannelXmitBurst

1.3.6.1.4.1.1166.1.19.6.1.1.7 cmCfgCovPrivacyEnable

cmCfgBpiTimeOutGroup

1.3.6.1.4.1.1166.1.19.6.2

1.3.6.1.4.1.1166.1.19.6.2.1.0 cmCfgAuthorWaitTimeOut

1.3.6.1.4.1.1166.1.19.6.2.2.0 cmCfgReauthorWaitTimeOut

1.3.6.1.4.1.1166.1.19.6.2.3.0 cmCfgAuthorGraceTime

1.3.6.1.4.1.1166.1.19.6.2.4.0 cmCfgOperWaitTimeOut

1.3.6.1.4.1.1166.1.19.6.2.5.0 cmCfgRekeyWaitTimeOut

1.3.6.1.4.1.1166.1.19.6.2.6.0 cmCfgTekGraceTime

1.3.6.1.4.1.1166.1.19.6.2.7.0 cmCfgAuthorRejectWaitTimeOut

cmOtherConfigGroup

1.3.6.1.4.1.1166.1.19.6.3

1.3.6.1.4.1.1166.1.19.6.3.1.0 cmCfgDsFreq

1.3.6.1.4.1.1166.1.19.6.3.2.0 cmCfgUsChannelId

1.3.6.1.4.1.1166.1.19.6.3.3.0 cmCfgNetAccessCtrl

1.3.6.1.4.1.1166.1.19.6.3.4.0 cmCfgSoftUpgradeFile

1.3.6.1.4.1.1166.1.19.6.3.5.0 cmCfgTotalSnmpWriteAccessCtrl

1.3.6.1.4.1.1166.1.19.6.3.6.0 cmCfgTotalSnmpMibObj

1.3.6.1.4.1.1166.1.19.6.3.7.0 cmCfgVendorId

1.3.6.1.4.1.1166.1.19.6.3.8.0 cmCfgVendorSpecific

1.3.6.1.4.1.1166.1.19.6.3.9.0 cmCfgModemCapabilities

1.3.6.1.4.1.1166.1.19.6.3.10.0 cmCfgModemIp

1.3.6.1.4.1.1166.1.19.6.3.11.0 cmCfgTotalEthernetMacAddrs

1.3.6.1.4.1.1166.1.19.6.3.12.0 cmCfgEthernetMacAddrs

1.3.6.1.4.1.1166.1.19.6.3.13.0 cmCfgTelcoSetting

1.3.6.1.4.1.1166.1.19.6.3.14.0 cmCfgSnmpIpAddr

1.3.6.1.4.1.1166.1.19.6.3.15.0 cmCfgMaxCpe

1.3.6.1.4.1.1166.1.19.6.3.16.0 cmCfgTftpServerTimeStamp

1.3.6.1.4.1.1166.1.19.6.3.17.0 cmCfgTftpServerProvModAddr

1.3.6.1.4.1.1166.1.19.6.3.18.0 cmCfgUuFlashParms

1.3.6.1.4.1.1166.1.19.6.3.19.0 cmCfgMulticastPromiscuous

1.3.6.1.4.1.1166.1.19.6.3.20.0

cmDhcpGroup

1.3.6.1.4.1.1166.1.19.10

cmDhcpObjectsGroup

1.3.6.1.4.1.1166.1.19.10.1

1.3.6.1.4.1.1166.1.21.1 cmTrapObjectValueChange

1.3.6.1.4.1.1166.1.21.62.1 ?

1.3.6.1.4.1.1166.1.21.62.2 ?

1.3.6.1.4.1.1166.1.21.62.3 ?

1.3.6.1.4.1.1166.1.21.62.4 ?

1.3.6.1.4.1.1166.1.21.2 cmTrapLog

1.3.6.1.4.1.1166.1.21.62.5 ?

1.3.6.1.4.1.1166.1.21.62.6

Regular expression generator.

http://www.txt2re.com/index-java.php3

Online FB2 Converter

http://www.online-convert.com/

Cable Access Technologies by Cisco

http://docwiki.cisco.com/wiki/Cable_Access_Technologies

Скорость в обратном канале.

Символьные и битовые скорости при использовании A-TDMA в зависимости от ширины канала и схемы модуляции.
Символьная скорость (кбод)	Ширина канала (кГц)	битовая скорость (кбит/с)
		QPSK	QAM 8	QAM 16	QAM 32	QAM 64
160	200	320	480	640	800	960
320	400	640	960	1280	1600	1920
640	800	1280	1920	2560	3200	3840
1280	1600	2560	3840	5120	6400	7680
2560	3200	5120	7680	10240	12800	15360
5120	6400	10240	15360	20480	25600	30720

Символьные и битовые скорости в зависимости от ширины канала, схемы модуляции и наличия треллистного кодирования при использовании S-CDMA.
Символьная скорость (кбод)	ширина канала (кГц)	скорость передачи (кбит/с)
		QPSK	QAM 8	QAM 16	QAM 32	QAM 64	QAM 128
1280	1600	2560	3840	6400	6400	7680	-
1280 (Тр. код)	1600	1280	2560	5120	5120	6400	7680
2560	3200	5120	7680	12800	12800	15360	—
2560 (Тр.код.)	3200	2560	5120	10240	10240	12800	15360
5120	6400	10240	15360	25600	25600	30720	—
5120 (Тр.код)	6400	5120	10240	20480	20480	25600	30720

Micro-reflections

What are micro-reflections?

A phenomenon that has been observed on many upstream links is micro-reflections. Micro-reflections are caused by impedance mismatches at both the source and load in a transmission line, and they create many small reflections between devices in the coaxial plant, such as between amplifiers and taps, or between power inserters and splitters, or between taps etc.
Micro-reflections were predicted on the downstream path, but were relatively benign because the high attenuation of the downstream cable damps out the reflections between devices. In the upstream however, the cable loss is so low that the micro-reflections have become an observable phenomena as well as a problem. If the vector diagram of Figure 1 were showing micro-reflections, the vector sum would comprise several smaller echoes, each with a different magnitude and rate of rotation with frequency.

Linear distortion is a problem for digital transmissions because it creates a problem called inter-symbol interference (or ISI). Figure 2 is a plot of two symbols that were transmitted one symbol period apart. The first symbol goes positive, and the second goes negative. The plot axes are voltage versus time.

Normally, on an oscilloscope you would see only one trace, but the single trace has been decomposed to show the two individual symbols. The symbols are sin(x)/(x) waveforms (impulse response of a “brick wall” filter), and the timing ticks at the top of the plot show the correct sampling times. Small circles on the plot also note correct sampling time.

Note that the first symbol component hits a positive peak just to the left of center, and the second symbol peak hits a negative peak just to the right of center, as noted by “x.” Observe that while any symbol is going through a peak, the other symbol is going through zero. If the channel has linear distortion, the waveforms will be “smeared” and no longer cross through zero at the sampling instant. A composite plot of many symbols that have been laid one atop the other is called an “eye” diagram, and will be described in detail later. A measure of inter-symbol interference is modulation error ratio (MER), which is a combination of linear distortions plus any additive interference, such as random noise or ingress, in the channel. MER also will be described in detail later.

A good place to observe echoes is on a magnitude plot. An echo’s amplitude can be calculated from the peak-to-peak excursions in the magnitude response that are caused by the echo. As an example, if the amplitude varies by plus and minus 7 percent, the peak-to-valley ripple will be 20*log(1.07/0.93)= 1.22 dB. The echo is down 20*log(.07)=23.09 dB relative to a carrier. One problem with observing echoes is that many conventional sweep systems have a frequency resolution that is much too coarse to display ripple.