~40 DupAcks And No Fast Retransmit !!

Hello all, I am using 4.3 BSD and from the below capture, I feel that there is some problem with the Fast Retransmit (unless I am missing something). I also recall that there was a short thread about some problems with Fast Retransmit earlier in Nov 2001 - that sender was resorting to the cos

Re: Duplicate Acks and Fast Retransmit

Hello, Thanks for the useful suggestions. I have one small doubt which I feel is reordering is happening. > > > 1. In my understanding, this should make the "sending" TCP get into Fast > > Retransmit mode each time it receives 2 identical acks (or 1 duplicate >ack). > > However, I am not seeing

Re: Duplicate Acks and Fast Retransmit

10.10.2.5001 > 10.10.10.1.1024: . ack 2224129 win 31856 (DF) 10:16:02.648358 10.10.10.2.5001 > 10.10.10.1.1024: . ack 2224129 win 33304 (DF) 10:16:02.648378 10.10.10.1.1024 > 10.10.10.2.5001: . 2224129:2225577(1448) ack 1 win 32942 (DF) 10:16:02.648396 10.10.10.1.1024 > 10.10.10.2.5

Duplicate Acks and Fast Retransmit

Hello, Below is the "netstat -p tcp" output on a FreeBSD 4.3 Machine. (with a couple of arrows to indicate lines of interest) --- tcp: 181061 packets sent 181039 data packets (262144000 bytes) -> 0 data pack

Re: Understanding fxp driver

Thanks. > > >4. Suppose I want to make the NIC interrupt the cpu for each packet, > >if I just reduce the Tx DMA length to 2-power-0, i.e,1, will it work? > >No, that won't work, but why would you want to do that? --> I have a virtual interface that Round Robins packets over the actual phys

Understanding fxp driver

Hello, Am trying to playaround and understand the Intel NIC fxp driver and it would be of help if you driver-gurus can please clarify a couple of points. I understand that Tx DMA size is 128. 1. what parameter exactly determines how many packets the NIC sends before interrupting the Host Cpu a

wrong ifa

Hello, what does the message "rtinit:wrong ifa was " exactly mean? I get it when using "ifconfig" on a NIC but I am able to use the NIC without any problems (apparently atleast). Can it cause any problems? Thanks for your time, Murthy __

ipsend packet generator

Hi, When I use the "ipsend" executable/tool available from the distribution and am generating a UDP packet, I am able to see the exact packet at the destination. However, when I try to compile the utility, (downloaded from Net) it is compiling without problem, but when I send a UDP packet, a

TCP Fast Retransmit

Hello, 1. Is there any sysctl variable to control the number of duplicate acks after which the sending TCP gets into a fast retransmit mode? 2. If I have a switch that does not support any port aggregation, and it is connected to a BSD machine with 2 ethernet NICs that have identical MAC, will

Re: dummynet (user confused)

>This is not always true...in some cases packet is passed again to the >firewall code, starting from next rule. > > > dummynet needs ipfw to build a pipe.. but if this rule is hit does it >means that any other will have no effect at all?? > >When "pipe" action is found that correspondes with pack

Re: Polling vs Interrupts (was Re: NEW CODE: polling support...)

Hi, First, let me thank for the nice detailed description of polling vs interrupts. I have a couple of questions. > >As the load level increases, your interrupt rate also grows, and >so does the work that you perform in each call to XX_intr(). > >The increase in interrupt rate is dangerous

Re: netgraph one2many question

Hi, I am a newbie to netgraph and have started looking at the sources and manpages. 1.In the context of one2many, in the manpage example, I see that it puts the interfaces into promiscuous mode. My question is, instead of turning on the promiscuous mode, will it not work if we use the "