similar to: TCP Delayed Ack

Hi everybody. Do you know about any way to read the TCP cwnd value (congestion window) on Linux? I have read that on Linux it is not possible to enable a socket option (to read to cwnd using the program trpt). Any way to read the cwnd would be good for me. thanks Antonio

Hi all. I experienced a strange behaviour in the "arp" command when I use the "pub" (publishing) flag. This is the scenario (I know it''s an unusual one, but it''s just for a test): __________ | | | host C | | | |__________| | __________|________________________________

Hi all. I would need to use a single physical interface on a Linux box to manage two different IP addresses (belonging to two separate logical subnets) with two different MAC address. (I need to emulate te presence of two separate physical interfaceses for a PC on the same LAN, at layer 2 and layer 3). Is it possible to use the linux ethernet bridging code and two tap interfaces for this

Hello. I have been trying to duplicate these u32 matching rules using TCNG, but without much success: tc filter add dev eth0 protocol ip parent 1:0 prio 1 u32\ match ip protocol 6 0xff \ match u8 0x05 0x0f at 0 \ match u16 0x0000 0xffc0 at 2 \ match u8 0x10 0xff at 33 \ flowid 1:10 Wondershaper 1.1a implements this and if I run it things seem to be shaped as expected. But this TCNG

Is there a way in Linux socket programming, when using TCP sockets to be able to require notifications of when the TCP ACK packets are received. If I send some data over a TCP socket, I''d like to know for sure if the data reached its recipient. A blocking "send" call, that blocks until all ACK''s for the data are received back, would be good enough. -- damjan |

Hello, I have a problem with the following setup, I hope you can help me. I have two internet gateways, one for LAN1 and the second for LAN2. +--------------+ GW1 more eth0| |eth4(SNAT) GW2 ---...routers...-----+ router +----------------- | | +---+------+---+ eth1|

I was trying the following setup with IPIP tunnels, one that used to work through another ISP, but no longer... Internal network | Linux box 1 (kernel 2.2.24) iif=10.0.0.1, extf=a.b.c.d, tunf=172.16.0.1 | |local metropolitan network | Another Linux box 2 (kernel 2.2.17, or 2.4.19, same result) iif=irrelevant, extf=x.y.z.v,

Sorry for making this a cross-post, but the pressure is on for getting this bandwidth shaper working. I have an interesting dilemma with bi-directional packet classification while doing ACK prioritization. This is an overly simplified summary of my setup: Internet | Eth0 | Router | Eth1 | Intranet A client on the Intranet establishes a flow to a server on the Internet. Packets get

Guys I''m a bit rusty and in a hurry, can anyone share with me how to prioritze TCP/ACK packets on an outgoing interface... I need these acknowledgements to get through on a congested DSL link... Thanks in advance! -- Kenneth Kalmer kenneth.kalmer@gmail.com Folding@home stats http://vspx27.stanford.edu/cgi-bin/main.py?qtype=userpage&username=kenneth%2Ekalmer

Hello, I''m wondering which of these filters is the best method for filtering ACK packages to achieve lowest delay possible on a dsl-link. This one ist from the wondershaper from the lartc-site: /sbin/tc filter add dev $EXTIF parent 1:0 protocol ip prio 0 u32 \   match ip protocol 6 0xff \   match u8 0x05 0x0f at 0 \   match u16 0x0000 0xffc0 at 2 \   flowid 1:10 Thats a suggestion

I am measuring the performance of one TCP connection over two symmetric paths. Packets are sent to two paths alternatively. I found that when the latency of each path are within 1ms, the overall TCP throughput is the *sum* of the throughput of the two paths. However, when the latency of the two paths increases to 5ms, the overal TCP throughput drops to the throughput of a *single* path. Has anyone

Hi there! It just occured to me that there is a difference between wshaper and wshaper.htb. In wshaper there is no check on the ACK-bit, all small packages are priorized. Is that the new way to go, or is it a "bug"? Greetings, Nils _______________________________________________ LARTC mailing list / LARTC@mailman.ds9a.nl http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO:

I have found a very strange problem. We found that the time of establishing the websocket connection between mobile phone and server was too long. Then I use tcpdump to capture the data and found that the problem maybe has something to do with window scale option in SYN packet. Here is the SYN packet for websocket connection: 55488 ? 443 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=64

This time the problem is that the ssh server only sets TCP_NODELAY for interactive (tty) sessions or if X11 forwarding is enabled. Neither of which are true for the use of the sftp subsystem. This hurts upload performance for sftp/sshfs. I'm not sure why this hasn't cropped up earlier. Were there any TCP_NODELAY related changes in the sshd code recently? Is there a reason not to

Hi all, Does anybody know a package to control the bandwidth using "TCP Congestion Control" method? Best Regards Hoomaan Naimi Afranet Network Administrator

I am wondering whether the commands ''tc filter change'' and ''tc filter replace'' are working. Googling around revealed a few emails on the LARTC stating that unfoirtunately they do not work. A quick check showed that they are still not implemented (properly). Some propose a solution to build a second tree of filters and apply the 2nd one when a need for it

Hi. I upgrade samba-ad-dc 4.12.6 to 4.13.2. I use GoogleWifiAP, it sometime access SambaAD-DC internal DNS by TCP protocol. Since recently, I troubled More and more connections without closing. TCPDUMPed(and wireshark) > No. Time Source Destination Protocol Length Info > 23 2020-11-10 19:21:40.775442 [GoogleWifiAP] [SambaAD-DC] TCP 74 48861 ? 53 [SYN] Seq=0 Win=29200 Len=0 MSS=1460

Hi lartc users, When a packet arrived to a network device it was stored on a skb structure and then enqueue on a network stack. One of the tests that I want to do is modify the TCP window size and verify the changes on the bandwidth between two hosts. To do that I need to know how to modify de packet window size and maybe recalculate the checksum value of the TCP packet. All I can do is read

Near the end of section 15.10, the following commands are shown for prioritizing SYN packets: iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x1 iptables -t mangle -I PREROUTING -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j RETURN Shouldn''t the "-I" option really be "-A"? Like so: iptables -t mangle -A

Hi, i''m newbie with traffic control. I create a script based in one from Jason Boxman (thx a lot). the upload flow is prioritized well, but when i download from a site, the down flow vary a lot from 25 KB to 4 KB. Before i use this script the downloads are constant between 22 an 25 KB. Perhaps there''s something wrong in my script ? I paste it, thx.