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Cisco 828 Power Supply, PWR-828-WW1 / 34-1856-03

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Cisco CISCO828 828 Router 1YearWarranty 10XAvailable

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MEM820-16D MEM800-16D 16MB Memory CISCO 827 828 827-4V

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Quantum Technology Certified Spec 8GB DDR3 PC3-10600 1333MHz RAM Memory DIMM Module for Cisco UCS B200 Blade Server

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Product Warnings

Cisco 828 and SOHO 78 Routers Release Notes

This document describes new and changed information for the Cisco 828 and SOHO 78 Routers Software Configuration Guide.

PPPoE MTU CLI

When a Cisco 828 or SOHO 78 router terminates PPPoE traffic, a PC connected to the Ethernet interface may have problems accessing Web sites if the PC's maximum transmission unit (MTU) setting is too high. The MTU contains maximum segment size (MSS) values for the TCP packets transmitted by the PC. The default MTU setting is 1460.

To reduce the MSS value, enter the following command on the router Ethernet interface:

ip tcp adjust-mss mss

where mss is 1452 or less.

This command works only if NAT is configured on the router.

Configuration Example

The following example shows a configuration of a PPPoE client with the MSS value set to 1452.

vpdn enable
no vpdn logging
!
vpdn-group 1
request-dialin
protocol pppoe
!
interface Ethernet0
ip address 192.168.100.1.255.255.255.0
ip tcp adjust-mss 1452
ip nat inside
interface ATM0
no ip address
no atm ilmi-keepalive
pvc 8/35
pppoe client dial-pool-number 1
!
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex B
dsl linerate AUTO
!
interface Dialer1
ip address negotiated
ip mtu 1492
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username sohodyn password 7 141B1309000528
!
ip nat inside source list 101 Dialer1 overload
ip route 0.0.0.0.0.0.0.0 Dialer1
access-list permit ip 192.168.100.0.0.0.0.255 any
MMI and ILMI Availability

The Cisco 828 and SOHO 78 platforms do not support Modem Management Interface (MMI) and Integrated Local Management Interface (ILMI). The default for these features is off.

PPPoATM QOS Availability

Quality of service (QOS) is available for PPP over ATM when multilink PPP is configured. If mutilink PPP is not configured, the output queuing defaults to first-in-first-out (FIFO), and it cannot be changed.

Maximum Loop Length Configuration

Use this command if reaching maximum loop length is more desirable than maintaining line signal quality. When you use this command, the line signal quality may deteriorate, CRC errors may increase, and bit error rate (BER) may not meet the standard requirement. This command is mostly applicable when lower line rates are used.

Use the following command if you want to reach maximum loop length:

dsl snr threshold <15db-30db>

where snr threshold is the threshold below which the router will retrain to the digital signal line multiplexer (DSLAM). The default is 23db.

Configuration Example

The following example shows a configuration for the dsl snr threshold command:

int atm0
shut
dsl snr threshold 15
no shut
end
sh run
Bulding configuration...
Current configuration : 902 bytes
!
.....
.....
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex B
dsl linerate AUTO
dsl snr threshold 15
debug dsl Command

Use the debug dsl commands to display digital subscriber line (DSL) errors. The no form of this command disables debugging output. Following is the command syntax:

debug dsl

no debug dsl

The following is sample debug dsl output:

router#deb dsl events
router#sh deb
dsl-phy:
events-info are on
router#
04:22:34: Modem Status : PMMS
04:22:44: Modem Status : Handshake
04:22:49: Modem Status : Training
04:23:03: Modem Status: Data
04:23:06: %LINK-3-UPDOWN: Interface ATM0, changed state to up
04:23:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to up
04:23:33: LOSW interupt
04:23:33: Loss of signal, re-train...
04:23:33: Modem Status : Handshake
04:23:35: %LINK-3-UPDOWN: Interface ATM0, changed state to down
04:23:36: %LINEPROTO-5-UPDOWM: Line protocol on Interface ATM0, changed state to down

Cisco 828

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Known issues/Warnings

Cisco 828 and SOHO 78 Routers Release Notes

This document describes new and changed information for the Cisco 828 and SOHO 78 Routers Software Configuration Guide.

PPPoE MTU CLI

When a Cisco 828 or SOHO 78 router terminates PPPoE traffic, a PC connected to the Ethernet interface may have problems accessing Web sites if the PC's maximum transmission unit (MTU) setting is too high. The MTU contains maximum segment size (MSS) values for the TCP packets transmitted by the PC. The default MTU setting is 1460.

To reduce the MSS value, enter the following command on the router Ethernet interface:

ip tcp adjust-mss mss

where mss is 1452 or less.

This command works only if NAT is configured on the router.

Configuration Example

The following example shows a configuration of a PPPoE client with the MSS value set to 1452.

vpdn enable
no vpdn logging
!
vpdn-group 1
request-dialin
protocol pppoe
!
interface Ethernet0
ip address 192.168.100.1.255.255.255.0
ip tcp adjust-mss 1452
ip nat inside
interface ATM0
no ip address
no atm ilmi-keepalive
pvc 8/35
pppoe client dial-pool-number 1
!
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex B
dsl linerate AUTO
!
interface Dialer1
ip address negotiated
ip mtu 1492
ip nat outside
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication pap callin
ppp pap sent-username sohodyn password 7 141B1309000528
!
ip nat inside source list 101 Dialer1 overload
ip route 0.0.0.0.0.0.0.0 Dialer1
access-list permit ip 192.168.100.0.0.0.0.255 any
MMI and ILMI Availability

The Cisco 828 and SOHO 78 platforms do not support Modem Management Interface (MMI) and Integrated Local Management Interface (ILMI). The default for these features is off.

PPPoATM QOS Availability

Quality of service (QOS) is available for PPP over ATM when multilink PPP is configured. If mutilink PPP is not configured, the output queuing defaults to first-in-first-out (FIFO), and it cannot be changed.

Maximum Loop Length Configuration

Use this command if reaching maximum loop length is more desirable than maintaining line signal quality. When you use this command, the line signal quality may deteriorate, CRC errors may increase, and bit error rate (BER) may not meet the standard requirement. This command is mostly applicable when lower line rates are used.

Use the following command if you want to reach maximum loop length:

dsl snr threshold <15db-30db>

where snr threshold is the threshold below which the router will retrain to the digital signal line multiplexer (DSLAM). The default is 23db.

Configuration Example

The following example shows a configuration for the dsl snr threshold command:

int atm0
shut
dsl snr threshold 15
no shut
end
sh run
Bulding configuration...
Current configuration : 902 bytes
!
.....
.....
dsl equipment-type CPE
dsl operating-mode GSHDSL symmetric annex B
dsl linerate AUTO
dsl snr threshold 15
debug dsl Command

Use the debug dsl commands to display digital subscriber line (DSL) errors. The no form of this command disables debugging output. Following is the command syntax:

debug dsl

no debug dsl

The following is sample debug dsl output:

router#deb dsl events
router#sh deb
dsl-phy:
events-info are on
router#
04:22:34: Modem Status : PMMS
04:22:44: Modem Status : Handshake
04:22:49: Modem Status : Training
04:23:03: Modem Status: Data
04:23:06: %LINK-3-UPDOWN: Interface ATM0, changed state to up
04:23:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to up
04:23:33: LOSW interupt
04:23:33: Loss of signal, re-train...
04:23:33: Modem Status : Handshake 
04:23:35: %LINK-3-UPDOWN: Interface ATM0, changed state to down
04:23:36: %LINEPROTO-5-UPDOWM: Line protocol on Interface ATM0, changed state to down

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