ArcticWolf Posted February 12, 2006 CID Share Posted February 12, 2006 Awhile back I had Bell Sympatico high speed....and I got a Speedstream 6520 modem/router combo in one from Bell.... I canceled My service with them about 3 months ago because I found a cheaper provider for the same speed download and more speed upload. But if I go to configure the router of course entering 192.168.#.# , it comes up with the Bell screen and how to set it up.... I have no problem with that.... but nowhere in the settings or advanced settings can I change the MTU from it's dang 1452 to 1492 which it should be for PPPOE. Anyone have an idea on what I can do or where to change it? Thanks Link to comment https://testmy.net/ipb/topic/11220-problem-with-routercant-find-anywhere-to-change-mtu/ Share on other sites More sharing options...
ArcticWolf Posted February 12, 2006 Author CID Share Posted February 12, 2006 Ok here is something that is weird, if I look at my router settings,under the Ethernet status, it says ports 1 & 2 ,which is both of my computers is saying I'm at 100M/Full duplex and both 1500MTU ... so why is it when I go to SpeedGuide.net it says MTU = 1452 MTU is not fully optimized for broadband. Consider increasing your MTU to 1500 for better throughput. If you are using a router, it could be limiting your MTU regardless of Registry settings. MSS = 1412 MSS is not optimized for broadband. Consider increasing your MTU value. Default TCP Receive Window (RWIN) = 513920 RWIN Scaling (RFC1323) = 3 bits (scale factor of 6) Unscaled TCP Receive Window = 64240 For optimum performance, consider changing RWIN to a multiple of MSS. Other values for RWIN that might work well with your current MTU/MSS: 519616 (MSS x 46 * scale factor of 259808 (MSS x 46 * scale factor of 4) 129904 (MSS x 46 * scale factor of 2) 64952 (MSS x 46) bandwidth * delay product (Note this is not a speed test): Your TCP Window limits you to: 20556.8 kbps (2569.6 KBytes/s) @ 200ms Your TCP Window limits you to: 8222.72 kbps (1027.84 KBytes/s) @ 500ms MTU Discovery (RFC1191) = ON Time to live left = 53 hops TTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000 (0) Link to comment https://testmy.net/ipb/topic/11220-problem-with-routercant-find-anywhere-to-change-mtu/#findComment-117591 Share on other sites More sharing options...
ROM-DOS Posted February 12, 2006 CID Share Posted February 12, 2006 ArcticWolf ~ just off hand, would that be a Actiontec DSL w/Wireless Networking/Gateway Modem? The reason I ask is because that's what I have with my Qwest DSL setup. . .and it's not PPPOE, mines PPPoA and my Ethernet Link Speed I set to 10Mbps Half-Duplex and set all my IP settings in Internet Protocol (TCP/IP) Properties manually to get the DNS Servers to run right. LOL ~ I'm still learning about all the DSL settings and some things still aren't making alot of sense, 'cause the way I actually set my IP address and default gateway isn't my 'REAL' (WAN) IP address nor my default gateway!! . . .but it works. . . .like when you enter 192.168.X.X. in the address bar ~ my 'default gateway' would be Actiontec's Status/Setup modem configuration interface ~ 192.168.X.X ~ so my LAN setup is pretty generic compared to my WAN setup, which has my 'REAL' IP address and gateway. . . .anyway, my MTU is 1500 and went with these Cablenet Adjuster settings; for my Qwest DSL @ Download: 7168kbps Upload: 896kbps Latency: 100ms MTU: 1500 DefaultReceiveWindow = 917504 DefaultSendWindow = 114688 DisableAddressSharing = 1 InitialLargeBufferCount = 200 InitialMediumBufferCount = 480 InitialSmallBufferCount = 640 LargeBufferSize = 819200 MaxFastTransmit = 64000 MediumBufferSize = 150400 Priority Boost = 1 SmallBufferSize = 12800 TransmitWorker = 32 FastSendDatagramThreshhold = EnableFastRouteLookup = 1 EnablePMTUDiscovery = 1 IgnorePushBitsOnReceives = 0 GlobalMaxTcpWindowSize = 90520 MaxFreeTcbs = MaxHashTableSize = MaxNormLookupMemory = SackOpts = 1 SynAttackProtect = 1 Tcp1323Opts = 1 TcpLogLevel = 1 TcpMaxDupAttacks = 3 TcpMaxHalfOpen = 100 TcpMaxHalfOpenRetired = 80 TcpRecvSegmentSize = 1460 TcpSendSegmentSize = 1460 TcpTimedWaitDelay = 30 TcpUseRFC1122UrgentPointer = 0 TcpWindowSize = 90520 MaxConnectionsPer1_0Server = 20 MaxConnectionsPerServer = 10 DefaultTimeToLive = 64 DefaultUserTOSSetting = 1 TcpMaxDataRetransmissions = 6 DefaultTOSValue = 240 These have been known to effect some DSL connections. If you see some minor issues, blank out these settings: MaxNormLookupMemory MaxFreeTcbs MaxHashTableSize FastSendDatagramThreshhold [edit] . . .just changed Priority Boost = 1 and DefaultUserTOSSetting = 1 and got a noticable increase in speed test! [if you can, leave EnableFastRouteLookup = 1 ~ enables big increase w/speed] :::.. Download Stats ..::: Connection is:: 5335 Kbps about 5.3 Mbps (tested with 2992 kB) Download Speed is:: 651 kB/s Tested From:: https://testmy.net (server2) Test Time:: Sun Feb 12 05:28:11 PST 2006 Bottom Line:: 95X faster than 56K 1MB download in 1.57 sec Diagnosis: Awesome! 20% + : 140.21 % faster than the average for host (qwest.net) Validation Link:: https://testmy.net/stats/id-XTM0WSO4R :::.. Upload Stats ..::: Connection is:: 762 Kbps about 0.8 Mbps (tested with 579 kB) Upload Speed is:: 93 kB/s Tested From:: https://testmy.net (server1) Test Time:: Sun Feb 12 05:29:39 PST 2006 Bottom Line:: 14X faster than 56K 1MB upload in 11.01 sec Diagnosis: Awesome! 20% + : 61.1 % faster than the average for host (qwest.net) Validation Link:: https://testmy.net/stats/id-KYBRXEMAP . . .not quite my 'advertised' speeds ~ but as fast as I can get it for now ~ lol Cablenut Adjuster is always a tweak in progress ~ for me ~ [edit, again] . . .now you got me all disconbobblated ~ I went to; HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesTcpipParameters and my DefaultMSS REG_SZ is 1452 and MTU REG_DWORD is 1492 in Interfaces my MTU is also 1492 . . .oh no, I'll try re-calculating my settings and see if it 'really' makes a difference! . . .just when I thought I had it right ~ lol Link to comment https://testmy.net/ipb/topic/11220-problem-with-routercant-find-anywhere-to-change-mtu/#findComment-117606 Share on other sites More sharing options...
ROM-DOS Posted February 12, 2006 CID Share Posted February 12, 2006 ArcticWolf ~ with new settings; Download: 7168kbps Upload: 896kbps Latency: 100ms MTU: 1492 DefaultReceiveWindow = 917504 DefaultSendWindow = 114688 DisableAddressSharing = 1 InitialLargeBufferCount = 200 InitialMediumBufferCount = 480 InitialSmallBufferCount = 640 LargeBufferSize = 819200 MaxFastTransmit = 64000 MediumBufferSize = 150400 Priority Boost = 1 SmallBufferSize = 12800 TransmitWorker = 32 FastSendDatagramThreshhold = EnableFastRouteLookup = 1 EnablePMTUDiscovery = 1 IgnorePushBitsOnReceives = 0 GlobalMaxTcpWindowSize = 90024 MaxFreeTcbs = MaxHashTableSize = MaxNormLookupMemory = SackOpts = 1 SynAttackProtect = 1 Tcp1323Opts = 1 TcpLogLevel = 1 TcpMaxDupAttacks = 3 TcpMaxHalfOpen = 100 TcpMaxHalfOpenRetired = 80 TcpRecvSegmentSize = 1452 TcpSendSegmentSize = 1452 TcpTimedWaitDelay = 30 TcpUseRFC1122UrgentPointer = 0 TcpWindowSize = 90024 MaxConnectionsPer1_0Server = 20 MaxConnectionsPerServer = 10 DefaultTimeToLive = 64 DefaultUserTOSSetting = 1 TcpMaxDataRetransmissions = 6 DefaultTOSValue = 240 :::.. Download Stats ..::: Connection is:: 5336 Kbps about 5.3 Mbps (tested with 2992 kB) Download Speed is:: 651 kB/s Tested From:: https://testmy.net (server2) Test Time:: Sun Feb 12 06:20:59 PST 2006 Bottom Line:: 95X faster than 56K 1MB download in 1.57 sec Diagnosis: Awesome! 20% + : 140.14 % faster than the average for host (qwest.net) Validation Link:: https://testmy.net/stats/id-F0R2PW5M7 :::.. Upload Stats ..::: Connection is:: 766 Kbps about 0.8 Mbps (tested with 579 kB) Upload Speed is:: 93 kB/s Tested From:: https://testmy.net (server1) Test Time:: Sun Feb 12 06:22:34 PST 2006 Bottom Line:: 14X faster than 56K 1MB upload in 11.01 sec Diagnosis: Awesome! 20% + : 61.6 % faster than the average for host (qwest.net) Validation Link:: https://testmy.net/stats/id-8LT3CRVPY . . .not much difference, but when I did the TCP/IP Analyzer it still shows MTU as 1500!! MTU = 1500 MTU is fully optimized for broadband. MSS = 1460 Maximum useful data in each packet = 1460, which equals MSS. Default TCP Receive Window (RWIN) = 917504 RWIN Scaling (RFC1323) = 4 bits (scale factor of Unscaled TCP Receive Window = 57344 For optimum performance, consider changing RWIN to a multiple of MSS. Other values for RWIN that might work well with your current MTU/MSS: 513920 (MSS x 44 * scale factor of 256960 (MSS x 44 * scale factor of 4) 128480 (MSS x 44 * scale factor of 2) 64240 (MSS x 44) bandwidth * delay product (Note this is not a speed test): Your TCP Window limits you to: 36700.16 kbps (4587.52 KBytes/s) @ 200ms Your TCP Window limits you to: 14680.064 kbps (1835.008 KBytes/s) @ 500ms MTU Discovery (RFC1191) = ON Time to live left = 54 hops TTL value is ok. Timestamps (RFC1323) = OFF Selective Acknowledgements (RFC2018) = ON IP type of service field (RFC1349) = 00000000 (0) Link to comment https://testmy.net/ipb/topic/11220-problem-with-routercant-find-anywhere-to-change-mtu/#findComment-117630 Share on other sites More sharing options...
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