Most recent kernel where this bug did *NOT* occur: none Distribution: Debian GNU/Linux 3.1 Sarge Hardware Environment: cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 11 model name : Intel(R) Celeron(TM) CPU 1400MHz stepping : 4 cpu MHz : 1615.892 cache size : 256 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse bogomips : 3233.64 cat /proc/iomem 00000000-0009ffff : System RAM 000a0000-000bffff : Video RAM area 000c0000-000c9fff : Video ROM 000f0000-000fffff : System ROM 00100000-1feeffff : System RAM 00100000-00297cdc : Kernel code 00297cdd-00347da7 : Kernel data 1fef0000-1fef2fff : ACPI Non-volatile Storage 1fef3000-1fefffff : ACPI Tables 1ff00000-1fffffff : reserved 20000000-200fffff : PCI Bus #01 20000000-2000ffff : 0000:01:00.0 20010000-2001ffff : 0000:01:06.0 20020000-20027fff : 0000:01:01.0 e0000000-e3ffffff : 0000:00:02.0 e4000000-e5ffffff : PCI Bus #01 e5000000-e50000ff : 0000:01:01.0 e5000000-e50000ff : 8139too e5001000-e50010ff : 0000:01:06.0 e5001000-e50010ff : 8139too e5002000-e50020ff : 0000:01:07.0 e5002000-e50020ff : 8139too e6000000-e607ffff : 0000:00:02.0 ffb00000-ffffffff : reserved cat /proc/ioports 0000-001f : dma1 0020-0021 : pic1 0040-0043 : timer0 0050-0053 : timer1 0060-006f : keyboard 0080-008f : dma page reg 00a0-00a1 : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : ide1 01f0-01f7 : ide0 02f8-02ff : serial 0376-0376 : ide1 03c0-03df : vga+ 03f6-03f6 : ide0 03f8-03ff : serial 0cf8-0cff : PCI conf1 4000-407f : 0000:00:1f.0 4000-4003 : PM1a_EVT_BLK 4004-4005 : PM1a_CNT_BLK 4008-400b : PM_TMR 4010-4015 : ACPI CPU throttle 4028-402b : GPE1_BLK 402c-402f : GPE0_BLK 4080-40bf : 0000:00:1f.0 5000-500f : 0000:00:1f.3 9000-afff : PCI Bus #01 9000-903f : 0000:01:00.0 9000-903f : 0000:01:00.0 9400-94ff : 0000:01:01.0 9400-94ff : 8139too 9800-98ff : 0000:01:06.0 9800-98ff : 8139too 9c00-9cff : 0000:01:07.0 9c00-9cff : 8139too a000-a01f : 0000:01:0a.0 a000-a01f : ne2k-pci b000-b01f : 0000:00:1f.2 b800-b81f : 0000:00:1f.4 f000-f00f : 0000:00:1f.1 f000-f007 : ide0 f008-f00f : ide1 lspci -vvv 0000:00:00.0 Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub (rev 04) Subsystem: Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- Latency: 0 Capabilities: <available only to root> 0000:00:02.0 VGA compatible controller: Intel Corp. 82815 CGC [Chipset Graphics Controller] (rev 04) (prog-if 00 [VGA]) Subsystem: Intel Corp. 82815 CGC [Chipset Graphics Controller] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Interrupt: pin A routed to IRQ 11 Region 0: Memory at e0000000 (32-bit, prefetchable) [size=64M] Region 1: Memory at e6000000 (32-bit, non-prefetchable) [size=512K] Capabilities: <available only to root> 0000:00:1e.0 PCI bridge: Intel Corp. 82801 PCI Bridge (rev 11) (prog-if 00 [Normal decode]) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Bus: primary=00, secondary=01, subordinate=01, sec-latency=32 I/O behind bridge: 00009000-0000afff Memory behind bridge: e4000000-e5ffffff Prefetchable memory behind bridge: 20000000-200fffff BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B- 0000:00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 11) Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 0000:00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 11) (prog-if 80 [Master]) Subsystem: Intel Corp.: Unknown device 2442 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Region 4: I/O ports at f000 [size=16] 0000:00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #1) (rev 11) (prog-if 00 [UHCI]) Subsystem: Intel Corp. 82801BA/BAM USB (Hub #1) Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Interrupt: pin D routed to IRQ 10 Region 4: I/O ports at b000 [size=32] 0000:00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 11) Subsystem: Intel Corp.: Unknown device 2442 Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Interrupt: pin B routed to IRQ 5 Region 4: I/O ports at 5000 [size=16] 0000:00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub #2) (rev 11) (prog-if 00 [UHCI]) Subsystem: Intel Corp.: Unknown device 2442 Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 0 Interrupt: pin C routed to IRQ 7 Region 4: I/O ports at b800 [size=32] 0000:01:00.0 Ethernet controller: 3Com Corporation 3c905 100BaseTX [Boomerang] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 64 (750ns min, 2000ns max) Interrupt: pin A routed to IRQ 11 Region 0: I/O ports at 9000 [size=64] Expansion ROM at 20000000 [disabled] [size=64K] 0000:01:01.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) Subsystem: Realtek Semiconductor Co., Ltd. RT8139 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 64 (8000ns min, 16000ns max) Interrupt: pin A routed to IRQ 5 Region 0: I/O ports at 9400 [size=256] Region 1: Memory at e5000000 (32-bit, non-prefetchable) [size=256] Expansion ROM at 20020000 [disabled] [size=32K] Capabilities: <available only to root> 0000:01:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) Subsystem: Realtek Semiconductor Co., Ltd. RT8139 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 64 (8000ns min, 16000ns max) Interrupt: pin A routed to IRQ 12 Region 0: I/O ports at 9800 [size=256] Region 1: Memory at e5001000 (32-bit, non-prefetchable) [size=256] Expansion ROM at 20010000 [disabled] [size=64K] Capabilities: <available only to root> 0000:01:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) Subsystem: Realtek Semiconductor Co., Ltd. RT8139 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 64 (8000ns min, 16000ns max) Interrupt: pin A routed to IRQ 10 Region 0: I/O ports at 9c00 [size=256] Region 1: Memory at e5002000 (32-bit, non-prefetchable) [size=256] Capabilities: <available only to root> 0000:01:0a.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS) Subsystem: Realtek Semiconductor Co., Ltd. RTL-8029(AS) Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Interrupt: pin A routed to IRQ 11 Region 0: I/O ports at a000 [size=32] Software Environment: scripts/ver_linux Linux monolith 2.6.16.37-imq #1 Sat Jan 13 14:41:05 YEKT 2007 i686 GNU/Linux Gnu C 3.3.5 Gnu make 3.80 binutils 2.15 util-linux 2.12p mount 2.12p module-init-tools 3.2-pre1 e2fsprogs 1.37 reiserfsprogs 3.6.19 reiser4progs line nfs-utils 1.0.6 Linux C Library 2.3.2 Dynamic linker (ldd) 2.3.2 Procps 3.2.1 Net-tools 1.60 Console-tools 0.2.3 Sh-utils 5.2.1 udev 056 Modules Loaded cls_u32 cls_tcindex ipt_IMQ imq sch_sfq sch_htb sch_dsmark xt_state iptable_mangle ipt_MASQUERADE iptable_nat ip_nat ip_conntrack iptable_filter ip_tables ipt_ULOG x_tables sha1 arc4 ppp_mppe ppp_async crc_ccitt ppp_generic slhc autofs4 ebtable_filter ebtables ne2k_pci 8390 8139too crc32 3c59x mii it87 hwmon_vid i2c_isa i2c_i810 i2c_algo_bit i2c_core Problem Description: I'm sharing single PPTP connection to my ISP for several client machines. Linux router establishes a PPTP connection with MPPE-128 encryption to the ISP and masquerades clients requests. Client ---> Router (MASQUERADE) ---( PPTP MPPE-128 )---> ISP When I'm trying to open ISP's web page (support.mgn.ru) from a client machine I get timeout and get errors in a router syslog: kernel: mppe_decompress[2]: osize too small! (have: 1480 need: 1483) Have value always MTU of ppp interface + 4, need value may vary up to MTU of eth interface + 4. Other sites can be accessed from client machines without problems. But on windows clients I see timeouts on yandex.ru as described in bug 6548. The ISP's site can be accessed from router without problems. It seems problem related with MTU size. Underlying LAN has MTU 1500 bytes, and PPTP tunnel has MTU = 1476 bytes. If I'm trying to ping ISP's host from client machine with small packets it works ok. But if I do ping with larger packets (by example -s 1449) I get an error from mppe_decompress listed above. Experimenting with MTU size of ppp interface, I have found that error disappear if ppp interface MTU size larger then MTU of ethernet interface. By example when I set mtu of ppp interface to 1512 while mtu of eth interface 1500 bytes I can contact ISP host without problem.
Sorry, I forgot to mention. Kernel version 2.6.13.5 with linux-2.6.13-mppe-mppc-1.3.patch.gz from http://mppe-mppc.alphacron.de/ works without errors.
How often have I fixed this? Let me count the times. One, two, three, three times. The reporter has in every case disappeared and not even acknowledged my patch so I've discarded it. One more try? This time it's in a bug system somewhere and not just an email to me, so I hope that means a patch will be tested.
Frank, The patch should be submitted to LKML; was it ever submitted/reviewed? Thanks.
yeah, what patch? Send it to me if you like.
Closing - no activity
is this the same as http://bugzilla.kernel.org/show_bug.cgi?id=5827