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Other Line Options: Difference between revisions

Other Line Options (view source)

Revision as of 15:52, 13 February 2016

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== Stability Options ==
*Available On BT 21CN ADSL▼
 
▲*Available Onon BT 21CN ADSL
These stability options refer to how aggressiveness BTs DLM is when monitoring and managing the line.▼
 
▲These stability options refer to how aggressiveness BTsBT's DLM is when monitoring and managing the line.
 
Usually we'd suggest keeping it on Normal (the default). Using increased stability options increases DLM sensitivity, so can have the side effect of making your line sync at lower speeds.
 
==Other Line Options==▼
*Most of these options are available on all lines▼
 
▲== Other Line Options ==
===FastTimeout===▼
Uses a PPP LCP Echo timeout of 10 seconds rather than 60 before entering the LostCarrier state.▼
 
▲*Most of these options are available on all lines:
'''More info:''' LCP echoes usually stop responding if the line has gone down. Our LCP monitoring, which produces the graphs will drop the line if there are no replies after 60 seconds. When [[bonding]] or used in a fall-back setup, having a faster timeout is useful in order to fall-back quicker.▼
 
=== MTU ===
Forces an MTU of regardless of what is negotiated by your router.▼
 
▲Forces an MTU of regardless of what is negotiated by your router.
'''More info:''' MTU is negotiated upon connection. We usually like 1500 MTU, however, there can be situations where by forcing 1492 is required. For example, if your router negotiated 1500 initially but you make a connection to a server that want's to re-negigotiate a lower MTU it will try to di this using ICMP, but if your router has a miss-confuigured firewall that blocks ICMP this can't be re-negoiated and the connection to the server will have problems. This is seen when connecting to certain web sites, bank web sites and https sites. Forcing 1492 from the start means that all your traffic is in packets of 1492 bytes and so won't have this problem.▼
 
▲'''More infoInfo:''' MTU is negotiated upon connection. We usually like 1500 MTU, however, there can be situations where by forcing 1492 is required. For example, if your router negotiated 1500 initially but you make a connection to a server that want's to re-negigotiate a lower MTU it will try to dido this using ICMP, but if your router has a miss-confuiguredconfigured firewall that blocks ICMP this can't be re-negoiated and the connection to the server will have problems. This is seen when connecting to certain web sites, bank web sites and https sites. Forcing 1492 from the start means that all your traffic is in packets of 1492 bytes and so won't have this problem.
===TCPFix===▼
Modifies the MSS in TCP packets so that it does not exceed the MRU▼
 
===MRUFix TCPFix ===
 
When sending IP traffic, ignore the MRU we receive during PPP negotiation. This can save a LCP renegotiation (which has been known to help OBSD based PPP's)▼
▲Modifies the MSS in TCP packets so that it does not exceed the MRU.
 
▲===TCPFix MRUFix ===
 
▲When sending IP traffic, ignore the MRU we receive during PPP negotiation. This can save a LCP renegotiation, (which has been known to help OBSDOpenBSD based PPP's).
 
=== LCPFix ===▼
 
Re-negotiates PPP LCP after acquiring the connection from BT, (who may provide a wrong highan MTU of 1500 onwhen ait should be 1492 link).▼
 
'''More infoInfo:''' During the pppPPP connection when your router initially syncs up and logs in to us, the pppPPP connection is passed via BT. Sometimes BT can change the MTU. With this option we will accept the PPP connection from BT, but will then re-negotiate the PPP connection with your router allowing the MTU to be reduced. On TalkTalk connections the MTU is always negotiated as 1492, you need to select LCPFix and an MTU of 1500 to fix this, (otherwise the LNS will use 1492 when re-negotiating).▼
 
▲=== FastTimeout ===
 
▲Uses a PPP LCP Echo timeout of 10 seconds rather than 60 before entering the LostCarrier state.
 
▲'''More infoInfo:''' LCP echoes usually stop responding if the line has gone down. Our LCP monitoring, which produces the graphs will drop the line if there are no replies after 60 seconds. When [[bonding]] or used in a fall-back setup, having a faster timeout is useful in order to fall-back quicker.
▲===LCPFix===
▲Re-negotiates PPP LCP after acquiring the connection from BT (who may provide a wrong high MTU of 1500 on a 1492 link)
 
▲'''More info:''' During the ppp connection when your router initially syncs up and logs in to us, the ppp connection is passed via BT. Sometimes BT can change the MTU. With this option we will accept the PPP connection from BT, but will then re-negotiate the PPP connection with your router allowing the MTU to be reduced. On TalkTalk connections the MTU is always negotiated as 1492, you need to select LCPFix and an MTU 1500 to fix this (otherwise the LNS will use 1492 when re-negotiating).
 
== Statistics and History ==
=== Stats ===
 
Shows the recent usage / quality stats for the line, with columns:
Time,Period,Polls Sent,Fail,Latency Min,Ave,Max,Traffic (bit/s) Rx,Tx,Score
 
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