Re: [leaf-user] Bering Tweaks
This appears to be the default in Bering/Shorewall for PPPoE and is already set. Thanks. === Work: http://www.olgclotteries.com [EMAIL PROTECTED] 888-345-7568 ext. 2205 Personal: http://www.mullan.ca [EMAIL PROTECTED] MSN:[EMAIL PROTECTED] === Tom Eastep teastep@shorewalTo: John Mullan [EMAIL PROTECTED] l.net cc: [EMAIL PROTECTED] Subject: Re: [leaf-user] Bering Tweaks 12/31/2002 02:26 PM --On Tuesday, December 31, 2002 2:05 PM -0500 John Mullan [EMAIL PROTECTED] wrote: Charles (and all). I'd be quite interested in any information that would optimize the path MTU within Bering between my Windoz boxes and my PPPoE connection (DSL modem of course). Could someone point in the right direction? Start by setting CLAMPMSS=Yes in /etc/shorewall/shorewall.conf. -Tom -- Tom Eastep\ Shorewall - iptables made easy Shoreline, \ http://shorewall.sf.net Washington USA \ [EMAIL PROTECTED] --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
[leaf-user] Bering Tweaks
Are there any tweaks for bering that I can use to pick up my cable connection? i downloaded an ipconfig.lrp package but i cannot get it to change the recieve window (one of the main things that the mtu patch does for windows to increase speed). is there something that i am missing? thanks- matt --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
Re: [leaf-user] Bering Tweaks
Matt Russell wrote: Are there any tweaks for bering that I can use to pick up my cable connection? i downloaded an ipconfig.lrp package but i cannot get it to change the recieve window (one of the main things that the mtu patch does for windows to increase speed). is there something that i am missing? If you are referring to the TCP recieve window size, that is a property particular to the TCP/IP stack of the system in question (windows, in your case), and is not affected by intermediate routers. Essentially, this value is the amount of memory allocated for storing incoming packets, and represents the maximum amount of TCP data the far end can send without getting a ACK back from your box. Windows assumes everyone is on a very high-speed local area network, so the default TCP settings provide sub-optimal results when run over high-latency networks (like the public internet or a corperate WAN). There's no way getting around having to tweak the registry settings for all your windows boxes if you want to make the most of your cable-modem speed across high-latency links (besides switching to linux, or some other OS with a better TCP/IP implementation :-) NOTE: There is another TCP parameter that *CAN* be controlled by the new 2.4 iptables settings in bering, related to the path MTU. Windows also does not properly perform path-MTU discovery, which means it continues to send full-size ethernet packets, even if an intermediate link in the route to the target system does not support that size without fragmentation (ie: the packets go through a VPN or PPPoE connection that wrapps the original data and reduces the effective MTU). This causes lots of unnecessary packet fragmentation which can have nasty effects on overall latency and link throughput. This doesn't sound like what you're looking for, however. -- Charles Steinkuehler [EMAIL PROTECTED] --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
Re: [leaf-user] Bering Tweaks
Matt Russell wrote about [leaf-user] Bering Tweaks: Are there any tweaks for bering that I can use to pick up my cable connection? i downloaded an ipconfig.lrp package but i cannot get it to change the recieve window (one of the main things that the mtu patch does for windows to increase speed). is there something that i am missing? Linux 2.4 kernels already have very optimized TCP implementation and usually it is not required to change anything. If you really want it, you may play with the settings in /proc/sys/net/ipv4. -- Best Regards, Vladimir Systems Engineer (RHCE) --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
Re: [leaf-user] Bering Tweaks
Charles (and all). I'd be quite interested in any information that would optimize the path MTU within Bering between my Windoz boxes and my PPPoE connection (DSL modem of course). Could someone point in the right direction? Thanks. === Work: http://www.olgclotteries.com [EMAIL PROTECTED] 888-345-7568 ext. 2205 Personal: http://www.mullan.ca [EMAIL PROTECTED] MSN:[EMAIL PROTECTED] === Charles Steinkuehler [EMAIL PROTECTED]To: Matt Russell [EMAIL PROTECTED] Sent by: cc: [EMAIL PROTECTED] [EMAIL PROTECTED]Subject: Re: [leaf-user] Bering Tweaks ceforge.net 12/31/2002 12:04 PM Matt Russell wrote: Are there any tweaks for bering that I can use to pick up my cable connection? i downloaded an ipconfig.lrp package but i cannot get it to change the recieve window (one of the main things that the mtu patch does for windows to increase speed). is there something that i am missing? If you are referring to the TCP recieve window size, that is a property particular to the TCP/IP stack of the system in question (windows, in your case), and is not affected by intermediate routers. Essentially, this value is the amount of memory allocated for storing incoming packets, and represents the maximum amount of TCP data the far end can send without getting a ACK back from your box. Windows assumes everyone is on a very high-speed local area network, so the default TCP settings provide sub-optimal results when run over high-latency networks (like the public internet or a corperate WAN). There's no way getting around having to tweak the registry settings for all your windows boxes if you want to make the most of your cable-modem speed across high-latency links (besides switching to linux, or some other OS with a better TCP/IP implementation :-) NOTE: There is another TCP parameter that *CAN* be controlled by the new 2.4 iptables settings in bering, related to the path MTU. Windows also does not properly perform path-MTU discovery, which means it continues to send full-size ethernet packets, even if an intermediate link in the route to the target system does not support that size without fragmentation (ie: the packets go through a VPN or PPPoE connection that wrapps the original data and reduces the effective MTU). This causes lots of unnecessary packet fragmentation which can have nasty effects on overall latency and link throughput. This doesn't sound like what you're looking for, however. -- Charles Steinkuehler [EMAIL PROTECTED] --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
Re: [leaf-user] Bering Tweaks
--On Tuesday, December 31, 2002 2:05 PM -0500 John Mullan [EMAIL PROTECTED] wrote: Charles (and all). I'd be quite interested in any information that would optimize the path MTU within Bering between my Windoz boxes and my PPPoE connection (DSL modem of course). Could someone point in the right direction? Start by setting CLAMPMSS=Yes in /etc/shorewall/shorewall.conf. -Tom -- Tom Eastep\ Shorewall - iptables made easy Shoreline, \ http://shorewall.sf.net Washington USA \ [EMAIL PROTECTED] --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
Re: [leaf-user] Bering Tweaks
John Mullan wrote: Charles (and all). I'd be quite interested in any information that would optimize the path MTU within Bering between my Windoz boxes and my PPPoE connection (DSL modem of course). Could someone point in the right direction? For windows registry settings, see one of the many speed-tweak sites on the 'net, for example: http://www.speedguide.net/Cable_modems/cable_registry.shtml It is also possible to control MTU size with the 2.4 kernel, where the kernel over-writes the portion of the TCP header that indicates the maximum allowable segment size, so the two ends negotiate a MSS smaller than your MTU without requiring registry tweaks. Some details about how this works are available in the advanced routing HOWTO: http://www.linux.org/docs/ldp/howto/Adv-Routing-HOWTO/lartc.cookbook.mtu-discovery.html http://www.linux.org/docs/ldp/howto/Adv-Routing-HOWTO/lartc.cookbook.mtu-mss.html There's also a bit of general info on MTU problems in the FreeS/WAN docs (an IPSec VPN solution for linux), with a lot more detailed information in the mailing list archives, if you really want to get into the nitty-gritty: http://www.freeswan.org/freeswan_trees/freeswan-1.99/doc/background.html#MTU.trouble http://www.freeswan.org/mail.html -- Charles Steinkuehler [EMAIL PROTECTED] --- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf leaf-user mailing list: [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/leaf-user SR FAQ: http://leaf-project.org/pub/doc/docmanager/docid_1891.html
