Analysis and prevention of Flooding attack by using TCP/IP or UDP programs or any other software

Classes — Sat, 26 Jan 2013 07:48:04 +0000

New Answer by Michael Tidmarsh

TCP/IP

Msatbh — Wed, 19 Dec 2012 18:12:20 +0000

New Discussion Post by TomLiotta

Strange DNS resolution.

Champs — Wed, 10 Oct 2012 16:55:12 +0000

New Discussion Post by TomLiotta

Device setup with static tcp address

Ace9 — Thu, 01 Dec 2011 04:19:15 +0000

New Answer by Michael Tidmarsh

Various Ethline failures

Wwillett — Tue, 02 Aug 2011 20:27:14 +0000

New Discussion Post by sashka

Connecting a machine to all systems in datacenter over TCP/IP

NewnanIT — Mon, 16 May 2011 14:10:44 +0000

We want to connect one keyboard, mouse and monitor to all systems in our datacenter. We want to do this over tcp/ip and not run a lot of cables. What equipment will facilitate this?

Why laptop window 7 common issues failing to connect internet?

Rakei — Tue, 03 May 2011 00:29:53 +0000

Can someone tell me why new Compaq/Toshiba laptop window 7 failing to connect internet? Have tested with other Internet Browser same fault. Fully confident not a infection related. Have tried to reset TCP/IP Winsock catalog -same fault.So far we have to install Service Pack 1 Updates to get it all back to work via Internet. Any reason why? Could it be Microsoft bug?

Subnet routing

AllyU — Mon, 21 Mar 2011 02:10:15 +0000

Will the way I setup my network and router to talk to multiple net cards on one PC
from other PC on separate network work?

First PC with two network cards

First network card
IP 192.168.3.106
Sub 255.255.255.0
Gateway 192.168.2.100

Second network card
IP 192.168.5.106
Sub 255.255.255.0
Gateway 192.168.2.100

Router
IP 192.168.2.100
Sub 255.255.255.0

Router table
First route
IP 192.168.3.0
Sub 255.255.255.0
Gateway 0.0.0.0
Second route
IP 192.168.5.0
Sub 255.255.255.0
Gateway 0.0.0.0

Third route
IP 192.168.6.0
Sub 255.255.255.0
Gateway 0.0.0.0

Second PC
First network card
IP 192.168.6.106
Sub 255.255.255.0
Gateway 192.168.2.100

I want to ping every network from each computer

FTP Failure after particular time

sim400 — Thu, 10 Mar 2011 17:30:18 +0000

Hi,

My iSeries (V5R4M0) system transfers the file to Unix server ovr SSL. It uses FTP Command ccc to set clear command channel. The problem is when we have big file and it takes more time, we get the error “No response from remote host; all connections closed.” What I observed is any time data transfer exceeds 2 hrs we will have this message in FTPOUT log. Also, it seems file gets transferred correctly. I have tested in Active and Passive modes. We get the same error in both cases. We don’t get this error message if data tranbsfer gets completed within 2 hrs.

I am attaching FTPOUT log and Debug 100 Log: (I have masked the IP & USer Ids below). Please reply if anyone gets any idea by looking into logs.

Output redirected to a file. Input read from specified override file. Connecting to remote host XXX.XX.XXX.XXX using port 21. 220- 220- 220 hostname FTP server (SecureTransport 4.9.2) ready. 234 SSLv23/TLSv1 Connection is secure. Enter login ID (LLLLLLL): 331 Password required for uuuuu. 230 Virtual user UUUUU logged in. UNIX Type: L8 200 PBSZ=0 200 PROT command successful Data protection level set to P. Enter an FTP subcommand. > ccc 200 command channel cleared. Enter an FTP subcommand. > DEBUG 100 DEBUG is on. DEBUG value is 100. Enter an FTP subcommand. > PUT EMOVE10LIB/IMTPHY05.IMTPHY05 DoNotUse1 >>> PASV 227 Entering Passive Mode (XXX,XX,XXX,XXX,40,81) >>> STOR DoNotUse1 150 Opening ASCII mode SSL data connection for DoNotUse1. Connection is secure. No response from remote host; all connections closed. Enter an FTP subcommand. > QUIT

Debug 100 Log:

Thu Mar 10 11:23:19 2011 Trace Point: QTMF2002FF Entry type: RETURN To: 1600 From: qtmfutil 1726 qtmf_CloseConnection(qtmf_Sock Thu Mar 10 11:23:19 2011 Trace Point: QTMF1A02FE Entry type: CALL From: 1600 To: qtmfsyp3 749 qtmf_RecReply(BOOL) INT, PCHAR Thu Mar 10 11:23:19 2011 Trace Point: QTMF1A01FE Entry type: CALL From: 1A02 To: qtmfsyp3 329 GetAChar()ta(PCHAR, INT, PCHAR Thu Mar 10 11:23:19 2011 Trace Point: QTMF1905FE Entry type: CALL From: 1A01 To: qtmfsyp2 1904 qtmf_SysRead(qtmf_SocketInfo_t Thu Mar 10 11:33:19 2011 Trace Point: QTMF190504 Entry type: DATA *000000000000000000000000000252CDAC1F3EFE000000000000000000020015*…………..êòÐ..Ú…………*…………..R…>………….* *8018CBFD00000000000000000000000500000000000000008000000000000000*Ø.ôÙ………………..Ø…….*…………………………..* *EF6C1F3245003E80000020000000000000000000000000000000000000000167*Õ%..á..Ø…………………..Å*.l.2E.>… ………………..g* *00000000000000008000000000000000EF6C1F3245005E900000200000000020*……..Ø…….Õ%..á.;°……..*……………..l.2E.^… …. * Thu Mar 10 11:33:19 2011 Trace Point: QTMF190508 Entry type: DATA *FFFFFFFA *ŸŸŸ³ *…. * Thu Mar 10 11:33:19 2011 Trace Point: QTMF1905FF Entry type: RETURN To: 1A01 From: qtmfsyp2 2185 qtmf_SysRead(qtmf_SocketInfo_t Thu Mar 10 11:33:19 2011 Trace Point: QTMF1A0100 Entry type: DATA *FFFFFFFA *ŸŸŸ³ *…. * Thu Mar 10 11:33:19 2011 Trace Point: QTMF1A01FF Entry type: RETURN To: 1A02 From: qtmfsyp3 407 GetAChar() Thu Mar 10 11:33:19 2011 Trace Point: QTMF1A0201 Entry type: DATA Thu Mar 10 11:33:19 2011 Trace Point: QTMF1A03FE Entry type: CALL From: 1A02 To: qtmfsyp3 2173 qtmf_CleanupConnections()PCHAR Thu Mar 10 11:33:19 2011 Trace Point: QTMF1A0301 Entry type: DATA *00000000000252CDAC1F3EFE0000000000000000000200158018CBFD00000000*……êòÐ..Ú…………Ø.ôÙ….*……R…>…………………* *000000000000000500000000000000008000000000000000EF6C1F3245003E80*…………….Ø…….Õ%..á..Ø*…………………….l.2E.>.* *0000200000000000000000000000000000000000000001670000000000000000*…………………..Å……..*.. ………………..g……..* *8000000000000000EF6C1F3245005E9000002000000000200000001000000000*Ø…….Õ%..á.;°…………….*………l.2E.^… …. ……..* Thu Mar 10 11:33:19 2011 Trace Point: QTMF2002FE Entry type: CALL From: 1A03 To: qtmfutil 1610 qtmf_CloseConnection(qtmf_Sock Thu Mar 10 11:33:19 2011 Trace Point: QTMF200203 Entry type: DATA *00000000000000000000000000000000 *……………. *……………. * Thu Mar 10 11:33:19 2011 Trace Point: QTMF200200 Entry type: DATA *000000000000000000000000 *………… *………… * Thu Mar 10 11:33:19 2011 Trace Point: QTMF2002FF Entry type: RETURN To: 1A03 From: qtmfutil 1726 qtmf_CloseConnection(qtmf_Sock Thu Mar 10 11:33:19 2011 Trace Point: QTMF1002FE Entry type: CALL From: 1A03 To: qtmfclie 3449 qtmf_InitGlobalVars()NT, PCHAR Thu Mar 10 11:33:19 2011 Trace Point: QTMF1002FF Entry type: RETURN To: 1A03 From: qtmfclie 3643 qtmf_InitGlobalVars() Thu Mar 10 11:33:19 2011 Trace Point: QTMF1802FE Entry type: CALL From: 1A03 To: qtmfsyp1 1189 qtmf_DisplayMessage(BOOL, PSZ, Thu Mar 10 11:33:19 2011 Trace Point: QTMF180200 Entry type: DATA *00000000E3C3D7F3C3F6C200 *….TCP3C6B. *………… * Thu Mar 10 11:33:19 2011 Trace Point: QTMF2000FE Entry type: CALL From: 1802 To: qtmfutil 724 qtmf_Trim(PSZ, const INT)PCHAR Thu Mar 10 11:33:19 2011 Trace Point: QTMF2000FF Entry type: RETURN To: 1802 From: qtmfutil 764 qtmf_Trim(PSZ, const INT) Thu Mar 10 11:33:19 2011 Trace Point: QTMF180205 Entry type: DATA *0035D596409985A2979695A28540869996944099859496A385408896A2A35E40*..No response from remote host; *.5..@……..@….@……@….^@* *81939340839695958583A3899695A240839396A285844B00 *all connections closed.. *…@………..@……K. * Thu Mar 10 11:33:19 2011 Trace Point: QTMF1803FE Entry type: CALL From: 1802 To: qtmfsyp1 443 GetNextWord(PCHAR, PCHAR, INT) Thu Mar 10 11:33:19 2011 Trace Point: QTMF1803FF Entry type: RETURN To: 1802 From: qtmfsyp1 534 GetNextWord(PCHAR, PCHAR, INT) Thu Mar 10 11:33:19 2011 Trace Point: QTMF1803FE Entry type: CALL From: 1802 To: qtmfsyp1 443 GetNextWord(PCHAR, PCHAR, INT) 5722TC1 V5R4M0 060210 FTP Debug Trace S10A9715 Date-03/10/11 Time-11:33:19 Page-594

Thanks

Sim

AS/400 STARTUP timing issues

OldSysAdmin — Wed, 02 Mar 2011 14:02:46 +0000

I’ve had more issues in 7.1 with timing and adding delays to insure subsystems or TCPIP are up before proceeding to the next step in the start up program. Has anyone ever used APIs to insure things are up instead of just adding larger delays, making the time till the system is available longer?

IT Answers » TCP/IP