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Thread: IPFW + DirectAdmin + FIREWALL RULESETS AVAILABLE HERE

  1. #21
    Join Date
    Oct 2009
    Location
    US
    Posts
    5

    IPFW DirectAdmin FIREWALL RULESETS AVAILABLE HERE

    Hello Everyone,

    Is it possible to block a port using ipfw in freebsd lets say I have a server with multiple IPs and I want to block one of my customer IPs port 25.

    Any help would be appreciated,

  2. #22
    Join Date
    Aug 2008
    Posts
    4,695
    ipfw add <rule-#-here> deny tcp from <customer-ip> to me 25

  3. #23
    Join Date
    May 2008
    Posts
    887
    Do you have any idea how to make it work fluent with EDNS0 (DNSSec)?

    When IPFW is enabled with that configuration, I get the following error on dnsviz:

    DNSKEY (alg 8, id 23746): No response was received from the server over UDP (tried 6 times) until the DO EDNS flag was cleared (however, this server appeared to respond legitimately to other queries with the DO EDNS flag set). (..., UDP_0_EDNS0_32768_4096)
    and

    No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size.
    Last edited by wattie; 06-12-2017 at 12:01 PM.

  4. #24
    Join Date
    May 2008
    Posts
    887
    OK guys, I found it:

    allow udp from any to any 53 limit src-addr 10
    is a NO go for DNSSec.

    Increase that to src-addr 50 and it will work!

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