can't download with DSL
I am using redhat 9 and we recently contracted SBC Yahoo DSL about 2 months ago. It only worked for 5 days from the 15 Nov to the 20th. Before and after then, every time I tried to download a file it wouldn't download past the first few kilobytes. the farthest I got was trying to download GNU Win II cd for windows, I got to 10.8 megabytes, then it just stopped. I tried wget and mozilla, same problem. Sometimes when I load a web page, the progress bar almost completes but never finishes and I have to reload the web page.
The modem has built in PPPoE client built into the modem. I had no trouble getting this modem to work with Redhat, since it was recognized bootup through eth0 via DHCP to get a IP (it is a dynamic IP). The strange thing about this is that I can upload a 16MB file to my e-mail address but I can't download the same file. It seems as if upload is unaffected. When I try to listen to streaming media (realplayer 10, listening to BBC or C-Span), it plays for the first 2 to 4 minutes, then it stops. I have 1.5 megabits downstream and 384 kilobits upstream. I'm going to try to slow down the downstream to 384 kilobits to see if it fixes my downloading problems. What I find strange is that I can download 10.8 megabytes without any probelm of this one file where other files only allow a few kilobytes to download. I want to call a technician to come to the house, but I don't have the money to do so for another several months. Note: I live in an apartment the technician readout of my modem is as follows: Technician Readout This information is for use by your service provider in diagnosing problems. 1 Manufacturer Efficient Networks, Inc. 2 Vendor ID b50045464e540400 3 Model Number 5100 4 Friendly Name SpeedStream 5100 ADSL Modem 5 Model Description Single Port Ethernet Modem 6 Model Name SpeedStream 7 Serial Number 2000B2394E21C 8 Hardware Version 1.0 9 Modem DSL Firmware Version a1.01.00.00 10 Modem Software Version 1.0.0.39 11 Hardware Options - 12 Software Options - 13 Modem Configured true 14 Time Since Last Boot 000 days 03:02:43 15 Current Time 2004/12/ 1 03:41:50 GMT 16 Time Servers 132.163.4.102 129.6.15.29 time-b.timefreq.bldrdoc.gov time-b.nist.gov 17 Time First Use 2004/10/02 17:02:38 GMT 30 Modem Health Status ok 31 DSL Link Status up 32 Time Since Last Sync 000 days 03:02:19 33 Loss of Signal false 34 Loss of Framing false 35 ATM Cell Delineation true 36 Internet Status up 37 Ethernet Link Status up 38 PPP Connection Status connected 39 PPP Last Connection Error None 40 PPP Uptime 000 days 03:00:59 50 Test ADSL Line Sync pass 51 Test ATM Cell Delineation pass 52 Test ATM OAM Segment Ping pass 53 Test ATM OAM End to End Ping fail 54 Test DSL Ethernet to ATM pass 55 Test LAN Ethernet Connection pass 56 Test Mac Bridge to LAN Ethernet pass 57 Test LAN USB Connection - 58 Test Mac Bridge to LAN USB - 59 Test PPPoE to Ethernet pass 60 Test PPP to PPPoE pass 61 Test PPPoE Server Connect pass 62 Test PPPoE Server Session pass 63 Test IP to WAN pass 64 Test IP to LAN Ethernet pass 65 Test IP to LAN USB - 66 Test IP to PPP pass 67 Test Validate WAN IP Address pass 68 Test Gateway Ping pass 69 Test DNS Well Known Host Query pass 70 Test Primary DNS Ping pass 71 Test Secondary DNS Ping pass 72 Test Mail Srvr 1 Ping skipped 73 Test Mail Srvr 2 Ping skipped 74 Test News Srvr 1 Ping skipped 75 Test News Srvr 2 Ping skipped 76 Test Web Portal 1 Ping skipped 77 Test Web Portal 2 Ping skipped 78 Test PPPoE Connect to GateWay pass 90 Active VCs provisioned 1 91 DSLAM Vendor Id - 92 DSL Line Mode ANSI 93 DSL Training Mode multimode 94 Conf VPI 0 95 Conf VCI 35 96 Conf PVC Search List 0/35, 8/35, 0/43, 0/51, 0/59, 8/43, 8/51, 8/59 97 VPI 0 98 VCI 35 99 VC Encapsulation LLC 100 DSL Line Type fast 101 DSL Line Interleaved Depth - 110 Default Device Enabled true 111 Default Device Mac Address 00:00:00:00:00:00 112 Default Device IP Address 69.152.147.243 113 Default Device Address Type public 114 Service Provider Name 115 Service Provider Phone 116 Service Provider URL 117 Service Provider Help URL 118 Modem MAC Address 00:0B:23:94:E2:1C 119 LAN DHCP Server Enabled true 120 DHCP Subnet Mask 255.255.0.0 121 DHCP Start IP Address 192.168.1.64 122 DHCP End IP Address 192.168.1.64 123 DHCP Default Gateway 192.168.0.1 124 DHCP Default Lease Time 000 days 00:10:00 125 Domain name domain_not_set.invalid 126 DHCP Leases Allocated 1 127 DHCP Leases Available 0 Rx Tx 140 Current Rate 1536 384 141 Previous Rate 0 0 142 DSL Max Rate - - 143 DSL Min Rate - - 144 Current ATTN DR 1536 - 145 Current SNRM 31.0 - 146 Current LATN - - 147 Current SATN 30.0 - 148 Current TP - 0.0 15 Min 24 Hour Yesterday 160 Time Elapsed 129 10929 0 161 Chan Received Blks 7620 645680 0 162 Chan Transmitted Blks 7620 645679 0 163 Chan Corrected Blks 0 0 0 164 Chan Uncorrected Blks 0 0 0 165 HEC Vcnt - - - 166 HEC Tcnt - - - 167 HEC Ucnt - - - 168 ICBE - - - 169 LCD 0 0 0 170 NCD 0 0 0 171 CVL 0 0 0 172 LCD Tx 0 0 0 173 NCD Tx 0 0 0 174 CVL Tx 0 0 0 175 LOF 0 0 0 176 LOS 0 0 0 177 LOSS - - - 178 LOL 0 0 0 179 LPR 0 0 0 180 ES 0 0 0 181 SESL 0 0 0 182 UASL 0 0 0 183 ECL 0 0 0 184 ECSL 0 0 0 185 ECL Tx 0 0 0 186 Inits - - - 187 FastR 0 0 0 188 Failed FastR - - - 189 DSL Initialization Errors 0 0 0 190 DSL Initialization Timeouts 0 0 0 191 DSL Line Search Initializations 0 0 0 192 DSL Loss of Margin Failures 0 0 0 193 ISP Connection Establishment - - - 210 VC ATM CoS ubr 211 VC ATM SCR - 212 VC ATM PCR - 213 VC ATM MCR - 214 VC ATM Burst Tolerance - 215 VC ATM CDV - 216 VC Max SDU 1528 217 ATM VC Receive Cells 205531 218 ATM VC Receive PDUs 12546 219 ATM VC Receive Frames 12546 220 ATM VC Receive Octets 9865497 221 ATM VC Receive Errors 325 222 ATM VC Receive Discards 0 223 ATM VC No Receive Buffers - 224 ATM VC Transmit Cells 52482 225 ATM VC Transmit PDUs 13046 226 ATM VC Transmit Frames 13046 227 ATM VC Transmit Octets 2519172 228 ATM VC Transmit Errors 0 229 ATM VC Transmit Discards 0 230 ATM VC Transmit Queue Full - 231 DSL Rate Mode - 232 Conf Target SNR Margin - Oct Err PkU PkNU Disc 240 LAN IP Tx 10210680 0 13564 211 0 241 LAN IP Rx 2290345 0 7 13750 0 242 LAN Ethernet Tx 10264980 0 13564 193 11 243 LAN Ethernet Rx 2345373 0 13750 7 0 244 LAN PPPoE Rx - - 0 0 - 245 IP 2684 Tx 1981940 0 12641 0 0 246 IP 2684 Rx 9472905 0 12141 0 0 247 Ethernet 2684 Tx 2519172 0 13046 0 0 248 Ethernet 2684 Rx 9865497 325 12546 0 0 260 Ethernet Rate 100Mbps 261 Ethernet Duplex Full 270 Internet Connection Type PPPoE 271 Modem Configuration Single Device Router 272 NAPT Enabled true 273 Modem IP Address 192.168.0.1 274 Modem Net Mask 255.255.0.0 275 Modem Broadcast Address 192.168.255.255 290 PPP UserName crytox@sbcglobal.net 291 PPP Service Name 292 PPP Access Concentrator 9A014060300207-rback3.elpstx 293 PPP Connect Mode Smart keep alive 294 PPP Idle Timeout 295 Conf PPP Authentication Protocol chap pap 296 PPP Authentication Protocol pap 297 WAN IP Address 69.152.147.243 298 WAN Subnet Mask 255.255.255.255 299 WAN Default Gateway 69.152.147.254 300 Conf DNS Servers - 301 DNS Servers 151.164.73.201 151.164.1.8 dns1.elpstx.sbcglobal.net dns1.rcsntx.sbcglobal.net 302 PPP MRU 1492 303 Conf PPP MRU 1492 304 LCP Echo 30 305 LCP Echo Retry 6 320 LAN Device Table Name Type IP Mac Leased Time IP Rx IP Tx PPPoE Rx Last Seen Status 320a - Ethernet 69.152.147.243 00:C0:4F:CE:E5:8E - - 13763 13792 0 - active 321 IP Gateway Table Type Metric Timeout Status 321a - - - - 322 IP Route Cache Table Net Addr NetMask Type GW Metric Timeout Iface Origin 322a 127.0.0.0 255.0.0.0 - 127.0.0.1 64 0 lo0 - 322b 192.168.0.0 255.255.0.0 - 192.168.0.1 180 311563 LAN - 322c Default Gateway - - 69.152.147.254 64 10964002 PPPoE - 322d 69.152.147.243 255.255.255.255 - 69.152.147.243 64 10964006 LAN - 323 Ethernet IP ARP Table IP MAC Flags 323a 239.255.255.250 01:00:5E:7F:FF:FA 0x00 323b 69.152.147.243 00:C0:4F:CE:E5:8E 0x01 330 Receive CCF ps Hlog - 331 Receive CCF ps HLin - 332 Receive QLN ps - 333 Receive SNR ps 333a 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 333b 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 333c 0.0 0.0 0.0 0.0 0.0 0.0 32.5 34.0 37.0 32.5 35.0 33.5 35.5 36.0 33.5 37.0 333d 34.5 35.0 35.5 36.0 36.0 36.5 36.5 36.5 36.5 36.5 37.0 36.5 36.5 36.5 36.5 36.5 333e 0.0 40.5 40.5 40.0 40.0 39.5 37.0 39.5 39.5 37.0 39.5 39.5 39.5 39.5 39.0 39.0 333f 39.0 39.0 39.0 38.5 38.0 36.5 36.5 36.5 36.5 36.5 36.5 36.5 36.5 36.5 36.5 36.5 333g 36.5 39.5 39.5 39.5 39.5 39.5 39.5 39.5 39.0 39.0 39.0 39.0 39.0 38.5 37.5 39.0 333h 39.0 39.0 39.0 39.0 39.0 38.5 38.5 38.5 38.5 38.5 38.5 38.5 38.5 38.0 38.0 38.0 333i 37.5 37.5 37.5 37.5 37.5 37.5 37.0 45.5 45.5 45.0 37.0 38.5 44.0 43.5 41.5 32.5 333j 38.5 42.5 41.5 41.5 0.0 0.0 42.0 42.0 43.0 42.5 43.0 42.5 42.5 42.5 41.0 40.0 333k 0.0 39.0 40.0 40.5 40.0 38.5 40.5 40.0 39.5 39.0 38.5 39.0 0.0 0.0 0.0 0.0 333l 0.0 37.0 37.0 37.0 35.5 35.0 33.0 0.0 0.0 0.0 0.0 0.0 0.0 34.0 34.0 36.0 333m 0.0 35.5 35.5 36.0 35.0 33.5 0.0 0.0 0.0 0.0 33.5 34.5 32.0 35.5 35.0 35.0 333n 35.0 0.0 34.5 0.0 0.0 0.0 0.0 0.0 34.0 34.5 0.0 34.5 0.0 0.0 0.0 0.0 333o 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 333p 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 334 ADSL DMT Bin Bits 334a 0 0 0 0 0 0 0 3 4 5 6 6 7 7 6 6 334b 0 6 6 6 6 6 6 5 6 5 5 4 4 4 0 0 334c 0 0 0 0 0 0 2 2 2 3 3 4 4 4 5 4 334d 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 5 334e 0 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 334f 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 334g 4 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 334h 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 334i 3 3 3 3 3 3 3 2 2 2 3 2 2 2 2 2 334j 2 2 2 2 0 0 2 2 2 2 2 2 2 2 2 2 334k 0 2 2 2 2 2 2 2 2 2 2 2 0 0 0 0 334l 0 2 2 2 2 2 2 0 0 0 0 0 0 2 2 2 334m 0 2 2 2 2 2 0 0 0 0 2 2 2 2 2 2 334n 2 0 2 0 0 0 0 0 2 2 0 2 0 0 0 0 334o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 334p 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 335 ADSL DMT Bin Atn - 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Do you have another OS and/or machine that you can try to download from? If so, does it have the same problem?
Do you see any error on the client, or does it just silently drop the download? An error I would expect to see in this situation would be "Connection reset by peer". |
I tried under windows 95, but same problem. There is no error message, it just stops downloading, wget doesn't give any error messages, it just hangs. Also, using Mozilla, the same thing happens, no error messages, sometimes it never starts.
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247 Ethernet 2684 Tx 2519172 0 13046 0 0
248 Ethernet 2684 Rx 9865497 325 12546 0 0 It looks like you're getting errors on the receive side of your ethernet connection. You might try: 1) replace your ethernet cable, 2) replace the ethernet adapter/card in your computer, 3) replace your modem Option 2 probably won't fix it if you tried two different computers, as it sounds like you did. When you tried the Windows computer, did you use the same ethernet cable and/or card? |
It smells like an MTU problem to me. Many DSL setups have this kind of problem, and it's quite easy to fix. You should check the current mtu for the network interface card you're using for the DSL link, and lower it by 63 or more. The default value on every interfaces i've seen is 1500, so 1437 should do. If it still doesn't work, you may lower it to any value and then increase it a little at a time until you get the largest value that works.
I don't know the specifics for this in Linux, but in FreeBSD you'd do `# ifconfig rl1 mtu 1437' to set the mtu to 1437 on the rl1 interface. This problem happens because the computer gets the mtu for the link to the modem, but the PPPoE uses a little of every packet (i think it's 63 bytes) for itself. Thus, when you receive data that doesn't fit one single packet, you PC expects to receive 1500 bytes (or whatever your mtu is) but only receives 1437, and won't process the other packet until it gets the remaining bytes -- which will never arrive. It works fine when sending data though. |
I will be calling a technician over to see what is wrong, on saturday 4th Dec 2004. I will post the results, here.
Note: I tried the MTU adjustments, by lowering the MTU to a rediculous value and then increasing it slowly. I was told that the MTU for my ISP is 1492, and the MTU on my machine should be 1500 for the 8 bytes that is added for routing ( I think). Will see what happens. Also, I tested both machines with 2 separate ethernet cards, independently.. I, also, used the same ethernet cable on both machines. |
You might try a different ethernet cable if only to eliminate it as the problem.
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Quote:
What you said is basically right though. The MTU for Ethernet is 1500. The MTU for PPPoE should be 1436 (64 bytes diff). The problem is likely stemming from the fact that the client is sending packets with the DF bit set. Of course, if the packet the server is trying to send back is too big for the PPPoE frame, and something along the line (like a TelCo router ;) ) asks for a frag (which it does via ICMP), and the host you're talking to is dropping ICMP (as many do now), your connection stalls and dies because the router threw the original frame that was too big on the floor. The telco router would frag them up for you, but you have the DF bit set. This is known as a "blackhole router". Note: FreeBSD's ppp has had a fix for this since ~4.3R, which is enabled by default. It's option enable tcpmssfixup in the ppp.conf file. |
You might just have a bad DSL filter on your phone line, which is causing data loss. Have you tried replacing that? My sister was running into problems similar to what you described, and the problem was solved simply by replacing the filter. Good luck with it -- J.W.
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We finally had the SBC technician come to the house. He tested with his laptop and his modem and he had the same probelm I had in downloading.
He said the problem was with the mains. He also said they would do some repair and call when they would complete their work. Will keep you posted when they finish their work. |
They finally fixed the DSL connection. I'm not sure what they did, but they told me that they would call me when it was fixed.
I appreciate the help from everybody here in trying to help me fix my trouble with our DSL connection. Note: they said it was a problem on SBC's side, with their wiring. |
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