Table Of Contents
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.
The following example shows a configuration of a PPPoE client with the MSS value set to 1452.vpdn enableno vpdn logging!vpdn-group 1request-dialinprotocol pppoe!interface Ethernet0ip address 192.168.100.1.255.255.255.0ip tcp adjust-mss 1452ip nat insideinterface ATM0no ip addressno atm ilmi-keepalivepvc 8/35pppoe client dial-pool-number 1!dsl equipment-type CPEdsl operating-mode GSHDSL symmetric annex Bdsl linerate AUTO!interface Dialer1ip address negotiatedip mtu 1492ip nat outsideencapsulation pppdialer pool 1dialer-group 1ppp authentication pap callinppp pap sent-username sohodyn password 7 141B1309000528!ip nat inside source list 101 Dialer1 overloadip route 0.0.0.0.0.0.0.0 Dialer1access-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.
The following example shows a configuration for the dsl snr threshold command:int atm0shutdsl snr threshold 15no shutendsh runBulding configuration...Current configuration : 902 bytes!..........dsl equipment-type CPEdsl operating-mode GSHDSL symmetric annex Bdsl linerate AUTOdsl 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:
no debug dsl
The following is sample debug dsl output:router#deb dsl eventsrouter#sh debdsl-phy:events-info are onrouter#04:22:34: Modem Status : PMMS04:22:44: Modem Status : Handshake04:22:49: Modem Status : Training04:23:03: Modem Status: Data04:23:06: %LINK-3-UPDOWN: Interface ATM0, changed state to up04:23:07: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM0, changed state to up04:23:33: LOSW interupt04:23:33: Loss of signal, re-train...04:23:33: Modem Status : Handshake04:23:35: %LINK-3-UPDOWN: Interface ATM0, changed state to down04:23:36: %LINEPROTO-5-UPDOWM: Line protocol on Interface ATM0, changed state to down
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Contacting TAC by Using the Cisco TAC Website
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