9/16/2023 0 Comments Tinywall stop icmp![]() ![]() PANĬreate a zone protection profile that is configured to protect against packet-based attacks: Review some FW rule to filter as well e.g. see ĭo also see the earlier mentioned post of the use of iptable and systctl. It will eventually has to drill into the packet (for those optional TCP field) to identify and drop the packet. Maybe good to check the dump as shared earlier in the postsĭoubt you can have the Windows FW to perform the filtering effectively. HKLM\system\CurrentControl Set\Servic es\Tcpip\P arameters HKLM\System\CurrentControl Set\Servic es\Tcpip\P arameters The following registry keywords in Windows Server 2003 are no longer supported and are ignored in Windows Server 2008 and Windows Server 2008 R2: This includes TCP Receive Window Scaling which necessitated adding Tcp1323Opts in the registry to enable it on older OS's.įurther check into MS tuning guide also did not shed anything close except this. With Windows 2008 and Windows 2008 R2, a number of the registry parameters used in previous OS's have been deprecated and all of these configurations are now autotuned by the OS. Suspecting this reg setting is deprecated Nmap done: 1 IP address (1 host up) scanned in 14.078 seconds Please report any incorrect results at . IP ID Sequence Generation: Busy server or unknown class TCP Sequence Prediction: Difficulty=262 (Good luck!) No exact OS matches for host (test conditions non-ideal). Running (JUST GUESSING) : Microsoft Windows Vista|2008 (90%), FreeBSD 6.X (88%)Īggressive OS guesses: Microsoft Windows Vista (90%), Microsoft Windows Server 2Ġ08 Beta 3 (89%), FreeBSD 6.2-RELEASE (88%) at 18:59Ĭompleted Parallel DNS resolution of 1 host. Initiating Parallel DNS resolution of 1 host. Used nmap to scan (as I can't get hping & rsysinfo even on RHEL anymore) & it showed the "Uptime"Ĭompleted Ping Scan at 18:59, 0.48s elapsed (1 total hosts) ![]() Indicated value 1 is not supported) under CurrentControlSet, ControlSet001 & ControlSet002 Just checked again & the D_Word(32) Tcp1323Opts was already set to 0 (not setting to 1 as one link In this case, the filter returned no packets, as expected. The second part ensures that a TSval value is there since the third will return TRUE if the field isn’t there as well as when it’s non-zero. The best filter I found to look for positive timestamps was ip.src = & l & !( val = 0). The timestamp option in a TCP packet contains two values: TSval (the source’s time) and TSecr (an echo of the time the destination last sent). If you do a packet capture to check timestamp as verification of setting The uptime guess is omitted if the target gives zeros or no timestamp options in its SYN/ACK packets, or if it does not reply at all. The uptime guess is accurate much of the time for most operating systems, so it is printed when available, but only in verbose mode. Set the Tcp1323Opts=0 in CurrentControlSet001, 002, etc as wellĬheck that there is no intermediary device scanned and surfacjbg this timestamp instead of the original target. So I guess the question is - what has it been replaced by? Īnyone know of any other ways to fix this in Win 2008 (R2) & Win2012? While not official Microsoft documentation, this Symantec page seems to indicate that Tcp1323Opts is deprecated in Windows Server 2008 and Windows Server 2008 R2. Iptables -A OUTPUT -p icmp -icmp-type timestamp-reply -j DROP Iptables -A INPUT -p icmp -icmp-type timestamp-request -j DROP ![]() "Create RHEL iptables firewall rules as additional enhancement: Needed? What's the equivalent rules in Windows Firewall, Juniper &įortigate & Cisco ACLs if any & if they help to get the scanner report Saw somewhere the following so is it sufficient or there's more rules + FullyQualifiedErrorId : CommandNotFoundExceptionĬan we set Windows Firewall rules instead & what's the exact Windows Firewall rules? + CategoryInfo : ObjectNotFound: (Set-netTCPsetting:String), CommandNotFoundException The spelling of the name, or if a path was included, verify that the path is correct and try again.Įt-netTCPsetting <<<< -SettingName InternetCustom -Timestamps disabled Term 'Set-netTCPsetting' is not recognized as the name of a cmdlet, function, script file, or operable program. ![]() PS C:\Windows\system32> Set-netTCPsetting -SettingName InternetCustom -Timestamps disabled I tried the PowerShell command given in the url above using administrator but got syntax In front of the server is not an option currently. Not sure if there's surefire answer ultimately but putting a firewall ![]()
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