We have an issue with a device on a route receiving TCP resets whenever a connection is attempted. This route goes through a third party. We have removed all blocks on our part of the network. My question is, how do access-lists deal with denied packets. Do they direct the packet to Null0 and simply drop the packet or would an extended access-list denying on a TCP rule send a reset thereby closing the connection? My own feeling is that there may be a firewall rule in the way as the reset is at layer 4. Would apprecieate some clarification.
Additionally a packet being denied by tha ACL causes the router to send a ICMP message (code 3(destination unreachable ), subcode 13(Communication Administratively Prohibited) to the source of the packet).
Hope this helps,
Harold Ritter Sr. Technical Leader CCIE 4168 (R&S, SP) firstname.lastname@example.org México móvil: +52 1 55 8312 4915 Cisco México Paseo de la Reforma 222 Piso 19 Cuauhtémoc, Juárez Ciudad de México, 06600 México
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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