Displaying 20 results from an estimated 504 matches for "mss".
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mpss
2002 Feb 25
10
Clamping tcp mss values to decrease latency
...a packet in
about 150ms. I want to cut this time down to decrease latency while
serving files, so I thought I''d try and reduce the packet size for the
offending upload streams (my webserver). The trick is that I also want all
other tcp connections to have the normal full packet size. Enter
MSS-clamping. My pppoe client for linux can do mss clamping on every
packet that goes out and come in. Not enough control. There is an option
to do mss-clamping in iptables, however this only works in the forward
table. I can''t match and control outgoing web connections, just
connections getti...
2003 Jun 01
1
Very weird network behaviour with 4.7-RELEASE-p10 (large)
...89538 200.203.183.32.1288 > 216.136.204.117.80: S 852569665:852569665(0) win 512
03:55:08.202061 216.136.204.117.80 > 200.203.183.32.1288: S 3771704683:3771704683(0) ack 85256966603:55:11.229621 216.136.204.117.80 > 200.203.183.32.1291: S 2387314094:2387314094(0) ack 2741695 win 57344 <mss 1460> (DF)
03:55:12.027408 200.203.183.32.1292 > 216.136.204.117.80: S 1532350261:1532350261(0) win 512
03:55:12.206721 216.136.204.117.80 > 200.203.183.32.1289: S 3305368856:3305368856(0) ack 1218353109 win 57344 <mss 1460> (DF)
03:55:12.239377 216.136.204.117.80 > 200.203.183...
2003 Apr 14
1
http://lartc.org/howto/lartc.cookbook.mtu-mss.html
current content below is annotated by some suggestions of things to
add along with questions for those who know more than I do [in brackets]
================
# iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu
This calculates the proper MSS for your link.
[If I understand the code correctly ... - expert intervention invited]
More precisely, this sets the MSS option to the MTU of the outgoing
link for this packet (so it must have already been routed) minus the
minimal size of a T...
2004 Aug 01
2
more on troubles with dmz www server
Thanks for the tips, Tom.
Here is the tcpdump -n output on the dmz computer - this gets repeated
several times as the remote computer attempts to connect:
18:11:54.264580 66.113.134.243.55080 > 192.168.2.1.8082: S
3210481212:3210481212(0) win 5840 <mss 1460,sackOK,timestamp 65650966
0,nop,wscale 0> (DF)
18:11:54.264696 192.168.2.1.8082 > 66.113.134.243.55080: S
2765561851:2765561851(0) ack 3210481213 win 16060 <mss 1460,sackOK,timestamp
8845122 65650966,nop,wscale 0> (DF)
18:11:55.336674 192.168.2.1.8082 > 66.113.134.243.55036: S...
2018 Apr 22
0
[Bug 351] Conntrack loses connection entries
...t;arlenslambert at gmail.com> ---
Comment on attachment 134
--> https://bugzilla.netfilter.org/attachment.cgi?id=134
tcpdump of communication during which conntrack seems to "forget" packets
14:39:54.925957 IP Y.Y.Y.Y.1818 > X.X.X.X.2000: S 849153605:849153605(0) win
65535 <mss 1460,nop,nop,sackOK>
14:39:57.943185 IP Y.Y.Y.Y.1818 > X.X.X.X.2000: S 849153605:849153605(0) win
65535 <mss 1460,nop,nop,sackOK>
14:39:58.241750 IP X.X.X.X.2000 > Y.Y.Y.Y.1818: S 3217892892:3217892892(0) ack
849153606 win 15972 <mss 1452,nop,nop,sackOK>
14:39:58.242082 IP Y.Y....
2004 Feb 17
1
Setting MSS
Hi
I have a (bizarre) problem with ssh, which someone has suggested may be
down to the MSS value being too high. I know that within Shorewall I can
clamp the MSS value to the MTU-40 value, but is there a way I can set
MSS to a discreet value? I just want to (dis)prove the MSS theory at the
moment (I know it isn''t a real fix).
Thanks,
Keith
2020 Jun 23
4
Voice broken during calls (again...)
...d right now...
> Could you suggest me something to restrict the problem?
> Currently, I think the problem can be:
>
> 1) on Asterisk
> 2) on my Gateway/Firewall
A couple of years ago I added this entry in my firewall:
/sbin/iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS
--clamp-mss-to-pmtu
since I had the problem downloading data from an Internet site using my
tablet.
I found this site explaining that:
https://lartc.org/howto/lartc.cookbook.mtu-mss.html
I really forgot this entry, but now I checked all entries in my
Firewall, and I see it, with my remar...
2017 Jun 17
1
client reconnect fails (was gluster heal entry reappears)
...rver and client (and vice versa) works fine.
Looking at a tcpdump on the brick side I see the TCP handshake for the
client. Looks strange because it is repeated after 1,2,4 seconds and so
on
18:55:51.176832 IP cadmins101.49151 > cfilers201.24007: Flags [S], seq 3453818375, win 28364, options [mss 4052,sackOK,TS val 362061385 ecr 0,nop,wscale 7], length 0
18:55:51.176884 IP cfilers201.24007 > cadmins101.49151: Flags [S.], seq 1929363096, ack 3453818376, win 28280, options [mss 4052,sackOK,TS val 13791464 ecr 362061385,nop,wscale 7], length 0
18:55:51.179391 IP cadmins101.49149 > cfiler...
2002 Feb 28
1
TCP MSS clampage
Hey,
My internet is provided via ADSL using PPPoE. When I take a look at
ifconfig''s output, I see that eth0 has an MTU of 1500, and ppp0 has an MTU
of 1492. I don''t _think_ that rp-pppoe (my pppoe util) is clamping the MSS.
I am noticing some latency when there''s a lot of bandwidth in use (but not
>90%). What should I clamp, eth0/ppp0? How much? And what with, rp-pppoe,
or tc/iproute2/etc ? I guess I don''t really understand clamping MSS, can
someone explain it in laymans terms? I have read...
2013 Jun 05
0
[Bug 662] netfilters clamp-mss-to-pmtu sets bad MSS when none was set before
...|RESOLVED
CC| |netfilter at linuxace.com
Resolution| |FIXED
--- Comment #5 from Phil Oester <netfilter at linuxace.com> 2013-06-05 16:36:04 CEST ---
Fixed in commit 409b545ac ("netfilter: xt_TCPMSS: Fix violation of RFC879 in
absence of MSS option"). Closing.
--
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2007 Jul 25
1
v1.1 alpha1: can't pop/imap login with LDAP
...missed it?
If there is no patch, then will there be any to be released sometime in
near future?
By the way, our dovecot configuration is:
-----
protocols: imap pop3
listen(default): *:40143
listen(imap): *:40143
listen(pop3): *:40110
ssl_disable: yes
disable_plaintext_auth: no
login_dir: /opt/mrn/mss/var/run/dovecot/login
login_executable(default): /opt/mrn/mss/libexec/dovecot/imap-login
login_executable(imap): /opt/mrn/mss/libexec/dovecot/imap-login
login_executable(pop3): /opt/mrn/mss/libexec/dovecot/pop3-login
mail_location: maildir:~/mail
mmap_disable: yes
mail_executable(default): /opt/mrn...
2003 Jun 02
3
[jik@kamens.brookline.ma.us: MSS clamping doesn''t work with masquerading through VPN?]
...If this is not the correct forum for my question, can anyone suggest a
better person or place to which I should direct it?
Thank you,
Jonathan Kamens
------- Start of forwarded message -------
From: Jonathan Kamens <jik@kamens.brookline.ma.us>
To: lartc@mailman.ds9a.nl
Subject: [LARTC] MSS clamping doesn''t work with masquerading through VPN?
Date: Fri, 23 May 2003 12:42:10 -0400
My employer uses a Microsoft VPN concentrator. I followed the
instructions at pptpclient.sourceforge.net to add support for that
concentrator to my Linux machine; after doing so, I was able to
succ...
2015 Jun 26
2
[Q] TCP segment sent is larger than peers advertised MSS
Hello,
I am in the process of troubleshooting another problem and noticed a
rather strange behavior with the openssh client. A client (OpenSSH 5.3)
and a server (6.7p1) do the TCP handshake, the client announces a MSS of
1460 (its MTU is 1500), while the server announces a MSS of 1260 (its
MTU is set to 1300). What troubles me is, that the client is sending the
server a frame of 2034 bytes (TCP segment length of 1968, during the
"Client: Key Exchange Init"). Why is it that the client seems to ignor...
2004 Jun 10
1
multiple connections
...ults. This is listening on eth1
as I try to SSH to the destination from an internal box (using lynx
to connect to the same destination results in a web page):
tcpdump: listening on eth1
07:13:12.614674 <Static IP>.37662 > <Dest IP>.ssh: S \
2808907073:2808907073(0) win 5840 <mss1460,sackOK,timestamp \
611570059 0,nop,wscale 0> (DF)
07:13:12.649772 <Dest IP>.ssh > <Static IP>.37662: S \
2414052745:2414052745(0) \
ack 2808907074 win 65535 <mss 1400,nop,wscale \
0,nop,nop,timestamp 2742813 611570059> (DF)
07:13:15.609403 <Static IP&g...
2003 Mar 11
0
Interrater and intrarater reliability
...(Result~Subject*Rater,data=Frame1)
meanSquares<-summary(aovFull)[[1]][,3]
for (raterAct in 1:tt)
{
raterActCat<-raterLabels[raterAct]
aovAct<-aov(Result~Subject,data=Frame1[Frame1$Rater==raterActCat,])
meanSquares<-c(meanSquares,summary(aovAct)[[1]][2,3])
}
names(meanSquares)<-c('MSS','MSR','MSSR','MSE',paste('MSE',levels(Frame1$Rater),sep=''))
MSS<-meanSquares[1]
MSR<-meanSquares[2]
MSSR<-meanSquares[3]
MSE<-meanSquares[4]
MSEpart<-meanSquares[-(1:4)] # the same for random and fixed, see table 2 (p. 780) and 3 (p. 281...
2017 Jan 26
2
cannot connect without user/pass on Windows 10
...ithout entering a user/pass. More
precisely: If you try to connect manually to \\IP it says "Username or
password incorrect" and prompts to enter a username/password. Despite
the server setting to map all users to guest (see further down). I did a
packet dump and the client pc asks NTLMSSP_NEGOTIATE, server replies
with an NTLMSSP_CHALLENGE and then the client pc simply hangs up (TCP RST).
Now the (more) interesting bit: all this only happens when you use a
"microsoft account", not if you use a local account. With a local
account on the laptop start -> run -> \\I...
2006 Jan 30
5
Debian Sarge Server with iptables behind D-Link Router
...tcpdump.
Here''s what tcpdump shows:
tcpdump for port 443:
Not working access from inside the lan to the servers external Name /
the servers external IP:
=> no connection
====================================
p54BE15A1.dip0.t-ipconnect.de.https: S 1859848764:1859848764(0) win
65535 <mss 1260,nop,nop,sackOK>
18:43:41.477631 IP lp-java.linkpool.3491 >
p54BE15A1.dip0.t-ipconnect.de.https: S 1859848764:1859848764(0) win
65535 <mss 1260,nop,nop,sackOK>
18:43:41.479358 IP p54BE15A1.dip0.t-ipconnect.de.https >
lp-java.linkpool.3491: R 0:0(0) ack 1859848765 win 0
18:43:41.9...
2009 Jan 14
1
Transport endpoint is not connected while mounting....
...a TCP dump showing port 7777 is not blocked (I added an
exception in IP tables)
(Node 0)
13:13:11.711539 IP (tos 0x0, ttl 64, id 18286, offset 0, flags [DF],
proto: TCP (6), length: 60) 10.128.7.33.47601 > 10.128.255.3.cbt: S,
cksum 0xd272 (correct), 3820380795:3820380795(0) win 5840 <mss
1460,sackOK,timestamp 4294911253 0,nop,wscale 6>
13:13:14.710703 IP (tos 0x0, ttl 64, id 18287, offset 0, flags [DF],
proto: TCP (6), length: 60) 10.128.7.33.47601 > 10.128.255.3.cbt: S,
cksum 0xc6ba (correct), 3820380795:3820380795(0) win 5840 <mss
1460,sackOK,timestamp 429491425...
2005 May 01
1
Partial F-test comparing full and reduced regression models
...earity problems (between three
regressor variables). I need a F-test that will allow me to compare
between full (with all variables) and partial models (minus 1=<
variables). The general F-test formula I'm using is:
F = {[SS(full model) - SS(reduced model)] / (#variables taken out)} /
MSS(full model)
Unfortunately, the ANOVA table parses the SS and MSS between the
variables and does not give the statistics for the regression model as
a whole, otherwise I'd do this by hand.
So, really, I have two questions: 1) Can I just add up all the SS and
MSS for all the variables to get...
2007 Apr 01
3
Doing partial-f test for stepwise regression
...; three regressor variables). I need a F-test that will allow me to
> compare between full (with all variables) and partial models (minus
> 1=< variables). The general F-test formula I'm using is:
>
> F = {[SS(full model) - SS(reduced model)] / (#variables taken out)} /
> MSS(full model)
>
> Unfortunately, the ANOVA table parses the SS and MSS between the
> variables and does not give the statistics for the regression model as
> a whole, otherwise I'd do this by hand.
>
> So, really, I have two questions: 1) Can I just add up all the SS and...