Do you have "Enable IP Routing" enabled in IP Packet Filtering properties? Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/authors/harrison/ Read the books! ----- Original Message ----- From: Radu Cruceana To: [ISAserver.org Discussion List] Sent: Saturday, June 15, 2002 12:35 PM Subject: [isalist] Re: Please help http://www.ISAserver.org The same result is obtained also for DNS query packets or telnet in port 110. The problem is not ICMP related. I have to publish those servers on the DMZ interface on ISA server. When I analized the traffic with Network Monitor, I saw that the packets are not routed from the external to DMZ interface. It works after disabling/enabling of each interface but when I restart the server or the Firewall service, it stop working again. -----Original Message----- From: Jim Harrison [mailto:jim@xxxxxxxxxxxx] Sent: Saturday, June 15, 2002 10:13 PM To: [ISAserver.org Discussion List] Subject: [isalist] Re: Please help http://www.ISAserver.org ISA blocks inbound ICMP by default (ping floods are a really basic DoS technique). Besides, ICMP doesn't guarantee traffic flow for other protocols.. Create packet filters for DNS / SMTP traffic between the 62.231.68.<ip> and the linux host. Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/authors/harrison/ Read the books! ----- Original Message ----- From: Radu Cruceana To: [ISAserver.org Discussion List] Sent: Saturday, June 15, 2002 9:47 AM Subject: [isalist] Please help http://www.ISAserver.org Hi, Please help a desperate man. I have the following configuration: Internet -> 62.231.68.x/24 --ISA--192.168.0.0/24 -> Internal LAN | 212.93.159.61/30 (Isa Interface to DMZ) | | | 212.93.159.62/30 (Linux mail Server on DMZ) So, From Internet I have ping on Linux Server but I don't have on ISA interface to DMZ. Routing is enabled and packet filters are specified with subnet for DMZ so it should include the 212.93.159.61. If I disable the interface to Internet and the interface to dmz and reenable them everything it's working ok. After that, if I restart the firewall service or if I reboot the machine bye bye ping on 212.93.159.61 from Internet. Also if I stop the firewall service I have ping on 212.93.159.61. This interface is crucial because I have to publish on it a dns server and a mail server. I've also try put specific packet filters for it but no result. I don't know what to do anymore (except to hang myself). Thx a lot in advance. ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: radu.cruceana@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub') ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')