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  • How to reply some request from which routes its came from?

    - by tacoen
    I wonder if we can reply some request from which route its came from? My Situation is like this: eth0 192.168.10.1 --> gw: 192.168.10.254 nm: 24 eth1 192.168.11.1 --> gw: 192.168.11.254 nm: 24 Since this two IP is on the same machine, normally when we ping to 192.168.11.1 from 192.168.10.2. This machine will not reply to 192.168.10.2 because 192.168.10.0/24 it's on eth0, and the packets where requested via eth1. Can I make it works? I'm using Linux ubuntu, and the application will be listen to eth1 only.

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  • Server 2003 Filter mobile devices via MAC

    - by msindle
    At one of my client's sites I need to keep my users unauthorized devices off the wireless. They all know the SSID and Password because many of them have laptops that need the wireless. I'm running out of IP address's and we have sent out numerous emails asking them to stay off, but like most users they ignore IT's email. I'm currently running Server 2003 as the GC/DC (but have 2008 servers in place) and 2 Netgear WNAP320. I've seen several posts similar to what I'm looking for but they seem to deal with Linux. My question is how do I go about doing this without migrating (scheduled for the end of the year) to a new server and is it possible to do this within Server 2003? Thanks msindle

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  • Network Table assistance

    - by mitchnufc
    I am designing a small network and have came up with the following table I am just wondering if this seems right, would appreciate some feedback, thanks. Network/Router First IP Last IP Subnet Host Broadcast Router 1 162.10.0.1 162.10.0.7 255.255.255.248 162.10.0.0 162.10.0.8 Network 1 162.10.1.1 162.10.2.253 255.255.254.0 162.10.1.0 162.10.2.254 Network 2 162.10.0.9 162.10.0.14 255.255.255.248 162.10.0.8 162.10.0.15 Router 2 162.10.0.17 162.10.0.18 255.255.255.252 162.10.0.16 162.10.0.19 Network 3 162.10.0.21 162.10.0.146 255.255.255.128 162.10.0.20 162.10.0.147 Router one is the IP assigned by the ISP

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  • u32 filter udp lenght 0 to 29

    - by Mark Ocok
    Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21668 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21669 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21670 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 Sep 30 18:20:02 30AA30 kernel: ** IN_UDP DROP ** IN=eth0 OUT= MAC=b8:ac:6f:99:8e:b2:a8:d0:e5:bf:71:81:08:00 SRC=66.225.232.169 DST=68.68.27.84 LEN=28 TOS=0x00 PREC=0x00 TTL=49 ID=21671 DF PROTO=UDP SPT=48153 DPT=16078 LEN=8 It's Spoofing attack dos, how to block Spoofing UDP lenght 0 to 29 using u32 Flooder target udp length udp 0 to 29

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  • Route outbound connections from local network through VPN

    - by Sharkos
    I have a server A running OpenVPN, an OpenVPN client B (a rooted Android phone as it happens) and a third party C (a laptop, tablet etc.) tethered to B. B can use the VPN to access the internet via A; C can use the tethered connection WITHOUT the VPN to access the internet via B. However, with the VPN on B active, I cannot load information from the internet on C. A appears to log similar traffic inbound and outbound when B or C attempt to load a webpage, say, but the VPN on device B reports no inbound traffic when the connection originated from C. Where should I look for packets being dropped, and what ip rules should I use to make sure they are passed back through the VPN and into the local network B <- C? (I'll obviously post whatever further information is needed.) Further info Without VPN: root@android:/ # ip route default via [B's External Gateway] dev rmnet0 [B's External Subnet] dev rmnet0 proto kernel scope link src [B's External IP] [B's External Gateway] dev rmnet0 scope link 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.1 With VPN: root@android:/ # ip route 0.0.0.0/1 dev tun0 scope link default via [B's External Gateway] dev rmnet0 [B's External Subnet] dev rmnet0 proto kernel scope link src [B's External IP] [B's External Gateway] dev rmnet0 scope link [External address of A] dev tun0 scope link 128.0.0.0/1 dev tun0 scope link 172.16.0.0/24 dev tun0 scope link 172.16.0.8/30 dev tun0 proto kernel scope link src 172.16.0.10 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.1 192.168.168.0/24 dev tun0 scope link

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  • Combine multiple network interfaces to connect to a dedicated server

    - by Dženis Macanovic
    this is an underpaid employee writing, who's apparently responsible for all the IT stuff in a very small (non-IT) company. Today said company got a bunch of PCs/workstations, a switch, a computer that's supposed to be used as a router, two DSL connections (each 16 MBit/s downstream and 1 MBit/s upstream) and a dedicated server which is hosted and managed professionally by a larger local company with some decent connection speed (1 GBit/s both directions if I'm not mistaken). This is what I've set up (note I'm not making use of the second DSL connection at all)... ETH0 ETH1 [ SWITCH ]---[LINUX DEBIAN ROUTER]---[DSL MODEM 1]---[INTERNET] | | | PC1 | | PC2 | ... ... when my boss asked me, if it was somehow possible to get 32 MBit/s downstream and 2 MBit/s upstream. At that time I replied "no" without thinking too much about it. Now I've just had the following idea... ETH1 ETH0 ETH0 ,---[DSL MODEM 1 (NON-STATIC IP)]---, ,---, ETH0 [ SWITCH ]---[LINUX DEBIAN ROUTER] [INTERNET] [LINUX DEBIAN SERVER]---[INTERNET] | | | '---[ DSL MODEM 2 (STATIC IP) ]---' '---' PC1 | | ETH2 ETH0 PC2 | ... ... but I have absolutely no clue how to implement that. Would that even be possible? What would the masquerading rules look like on the router? What about the server? I didn't find anything on the internet, mainly because I couldn't come up with any good keywords to search for to begin with. English obviously isn't my first language. Thanks in advance for your time!

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  • What ports, besides 80, need to be available to send (only send) email using phpmailer to gmail over SSL?

    - by Wobblefoot
    Using phpmailer I keep getting a 110 timeout and "Unable to connect to host" when sending email from my web server. The authentication details are right and they work on another server I have (login, pwd, ports etc and gmail acct set up for SSL connections on 465), but it's failing on my new server. FIREWALL: I allow related/established, port 80 and a port for SSH on INPUT, then this on OUTPUT: 7906 474K DROP tcp -- any any anywhere anywhere tcp dpt:smtp 0 0 ACCEPT tcp -- any any localhost.localdomain yw-in-f109.1e100.net tcp dpt:submission 0 0 ACCEPT tcp -- any any localhost.localdomain gx-in-f109.1e100.net tcp dpt:ssmtp 0 0 DROP tcp -- any any anywhere anywhere tcp dpt:submission 9 540 DROP tcp -- any any anywhere anywhere tcp dpt:ssmtp This output chain works on my other server and disabling it doesn't get mail delivered either. WEB SERVER: Varnish (80) Nginx (8088) Drupal 7 PHP5-FPM APC MySQL All works beautifully, except for outgoing email. What else could it be? I understand phpmailer does NOT require a local MTA or procmail (this is sort of the point - I don't want the security or admin overhead of a full blown MTA on my web server). Am I wrong? Do I need an MTA as well? What local ports and programs are used to authenticate over SSL and route mail using phpmailer? Any ideas at all greatly appreciated - wasted a day on this nonsense already!

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  • It is okay to set MASQUERADE at 2 network interfaces in a Linux server?

    - by Patrick L
    There is a Linux server with 3 network interfaces, eth0, eth1, eth2. IP forwarding has been turn on in this server. eth0 is connected to 10.0.1.0/24. Its IP is 10.0.1.1. eth1 is connected to 172.16.1.0/24. Its IP is 172.16.1.1. Server A can ping router C at 172.16.1.2. eth2 is connected to 192.168.1.0/24. Its IP is 192.168.1.1. Server A can ping server B at 192.168.1.2. Router C is able to route to 172.16.2.0/24 and 172.16.3.0/24. [10.0.1.0/24] | 172.16.2.0/24------| | [C]------172.16.1.0/24------[A]------192.168.1.0/24------[B] 172.16.3.0/24------| We have set MASQUERADE at eth0. When server B (192.168.1.2) connect to 10.0.1.0/24, IP MASQUERADE will happen at eth0. Can we set MASQUERADE at eth1? Is it okay to set MASQUERADE at more than 1 network interfaces in Linux?

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  • What's the best way to forward traffic on a specific port to another machine?

    - by Ankit
    The setup I have is this: [client01] <-A-> [server01] <-B-> [server02] client01 can access port 9300 on server01 (connection A). server01 can access port 9300 on server02 (connection B). What's the best way to make all traffic on port 9300 to server01 go to port 9300 on server02? I can successfully do this with an ssh tunnel from client01 to server01 to server02, but I don't want to have to run ssh on client01. When I ssh from server01 to server02 forwarding port 9300 (ssh -g -L9300:localhost:9300 server02 on server01), it doesn't work -- am I using the wrong command?

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  • How to configure linux routing/filtering to send packets out one interface, over a bridge and into another interface on the same box

    - by rj75
    I'm trying to test a ethernet bridging device. I have multiple ethernet ports on a linux box. I would like to send packets out one interface, say eth0 with IP 192.168.1.1, to another interface, say eth1 with IP 192.168.1.2, on the same subnet. I realize that normally you don't configure two interfaces on the same subnet, and if you do the kernel routes directly to each interface, rather than over the wire. How can I override this behavior, so that traffic to 192.168.1.2 goes out the 192.168.1.1 interface, and visa-versa? Thanks in advance!

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  • how to monitor traffic at port 53 (DNS)

    - by Registered User
    I am a bit confused with the abundant tcpdump tutorials on internet. I am having a few of the virtual machines running on a virtualization server.Where I am debugging a problem.Port 53 is the one in problem. I have a bridged setup where out of 4 LAN cards on the machine in question one is active and it is xen-br0 I want to check if there is any request coming on port 53 on the server by other machines on LAN in question. I also want to see if the guest operating systems on LAN or any other machine is sending traffic at port 53.Due to abundant messages being generated via tcpdump I am finding it difficult to grep the output at desired port. So how can I use it if some one can give an example that would be helpful. Thanks in advance.

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  • Using u32 together with extension headers (how to jump over them?)

    - by bortzmeyer
    I'm trying to filter on some parts of the payload, for an IPv6 packet with extension headers (for instance Destination Options). ip6tables works fine with conditions like --proto udp or --dport 109, even when the packet has extension headers. Netfilter clearly knows how to jump over Destination Options to find the UDP header. Now, I would like to use the u32 module to match a byte in the payload (say "I want the third byte of the payload to be 42). If the packet has no extension headers something like --u32 "48&0x0000ff00=0x2800"` (48 = 40 bytes for the IPv6 header + 8 for the UDP header) works fine, If the packet has a Destination Options, it no longer matches. I would like to write a rule that will work whether the packet has Destination Options or not. I do not find a way to tell Netfilter to parse until the UDP header (something that it is able to do, otherwise --dport 109 would not work) then to leave u32 parse the rest. I'm looking for a simple way, otherwise, as BatchyX mentions, I could write a kernel module doing what I want.

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  • Do newer physical interfaces make a better linux firewall?

    - by pfyon
    At work we use an old (10 year old) linux box with 4 interfaces to act as router/firewall for the network. There's never really been a need to change it since it's stable and handles all our needs. I'm wondering, though, would replacing the network interfaces with newer ones provide a benefit? Besides the obvious bandwidth increase (eg. 100MBit to GBit), would there be a latency reduction, or do newer cards pretty much do the same thing as old ones?

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  • ip6tables blocking output traffic

    - by jmccrohan
    My OpenVZ VPS is blocking outbound IPv6 traffic, but correctly filtering inbound IPv6 traffic. Below is my ip6tables-restore script. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -i lo -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p ipv6-icmp -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p udp -m udp --dport 1194 -j ACCEPT -A INPUT -p tcp -m tcp --dport 51413 -j ACCEPT -A INPUT -p udp -m udp --dport 51413 -j ACCEPT -A INPUT -m limit --limit 5/min -A INPUT -j REJECT --reject-with icmp6-adm-prohibited -A FORWARD -j ACCEPT -A OUTPUT -j ACCEPT COMMIT ICMPv6 traffic is still able to pass both inbound and outbound. When I flush these rules using -F, outbound traffic flows fine. What am I missing here? EDIT: It appears that ip6tables is marking ESTABLISHED packets as INVALID. Consequently, the outbound traffic is NOT actually being blocked. The reply packets are not allowed inbound again, hence appearing like blocked outbound traffic. Allowing INVALID packets inbound solves the outbound issue, but also renders the inbound filter useless.

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  • iptables advanced routing

    - by Shamanu4
    I have a Centos server acting as a NAT in my network. This server has one external (later ext1) interface and three internal (later int1, int2 and int3). Egress traffic comes from users via int1 and after MASQUERADE goes via ext1. Ingress traffic comes from ext1, MASQUERADE, and goes via int2 or int3 according to static routes. | ext1 | x.x.x.x/24 +---------|----------------------+ | | | Centos server (NAT) | | | +---|------|---------------|-----+ | | | int1 | | int2 | int3 10.30.1.10/24 | | 10.30.2.10/24 | 10.30.3.10/24 ^ v v 10.30.1.1/24 | | 10.30.2.1/24 | 10.30.3.1/24 +---|------|---------------|-----+ | | | | | | | v v | | ^ -Traffic policer- | | |_____________ | | | | | +------------------|-------------+ | 192.168.0.1/16 | | Clients 192.168.0.0/16 The problem: Egress traffic seems to be dropped after PREROUTING table. Packet counters are not changing on MASQUERADE rule in POSTROUTING. If I change the routes to clients causing the traffic go back via int1 - everything works perfectly. current iptable configuration is very simple: # cat /etc/sysconfig/iptables *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -I INPUT 1 -i int1 -j ACCEPT -A FORWARD -j ACCEPT COMMIT *nat -A POSTROUTING -o ext1 -j MASQUERADE # COMMIT Can anyone point me what I'm missing? Thanks. UPDATE: 192.168.100.60 via 10.30.2.1 dev int2 proto zebra # routes to clients ... 192.168.100.61 via 10.30.3.1 dev int3 proto zebra # ... I have a lot of them x.x.x.0/24 dev ext1 proto kernel scope link src x.x.x.x 10.30.1.0/24 dev int1 proto kernel scope link src 10.30.1.10 10.30.2.0/24 dev int2 proto kernel scope link src 10.30.2.10 10.30.3.0/24 dev int3 proto kernel scope link src 10.30.3.10 169.254.0.0/16 dev ext1 scope link metric 1003 169.254.0.0/16 dev int1 scope link metric 1004 169.254.0.0/16 dev int2 scope link metric 1005 169.254.0.0/16 dev int3 scope link metric 1006 blackhole 192.168.0.0/16 default via x.x.x.y dev ext1 Clients have 192.168.0.1 as gateway, which is redirecting them to 10.30.1.1

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  • Linux iptables / conntrack performance issue

    - by tim
    I have a test-setup in the lab with 4 machines: 2 old P4 machines (t1, t2) 1 Xeon 5420 DP 2.5 GHz 8 GB RAM (t3) Intel e1000 1 Xeon 5420 DP 2.5 GHz 8 GB RAM (t4) Intel e1000 to test linux firewall performance since we got bitten by a number of syn-flood attacks in the last months. All machines run Ubuntu 12.04 64bit. t1, t2, t3 are interconnected through an 1GB/s switch, t4 is connected to t3 via an extra interface. So t3 simulates the firewall, t4 is the target, t1,t2 play the attackers generating a packetstorm thorugh (192.168.4.199 is t4): hping3 -I eth1 --rand-source --syn --flood 192.168.4.199 -p 80 t4 drops all incoming packets to avoid confusion with gateways, performance issues of t4 etc. I watch the packet stats in iptraf. I have configured the firewall (t3) as follows: stock 3.2.0-31-generic #50-Ubuntu SMP kernel rhash_entries=33554432 as kernel parameter sysctl as follows: net.ipv4.ip_forward = 1 net.ipv4.route.gc_elasticity = 2 net.ipv4.route.gc_timeout = 1 net.ipv4.route.gc_interval = 5 net.ipv4.route.gc_min_interval_ms = 500 net.ipv4.route.gc_thresh = 2000000 net.ipv4.route.max_size = 20000000 (I have tweaked a lot to keep t3 running when t1+t2 are sending as many packets as possible). The result of this efforts are somewhat odd: t1+t2 manage to send each about 200k packets/s. t4 in the best case sees aroung 200k in total so half of the packets are lost. t3 is nearly unusable on console though packets are flowing through it (high numbers of soft-irqs) the route cache garbage collector is no way near to being predictable and in the default setting overwhelmed by very few packets/s (<50k packets/s) activating stateful iptables rules makes the packet rate arriving on t4 drop to around 100k packets/s, efectively losing more than 75% of the packets And this - here is my main concern - with two old P4 machines sending as many packets as they can - which means nearly everyone on the net should be capable of this. So here goes my question: Did I overlook some importand point in the config or in my test setup? Are there any alternatives for building firewall system especially on smp systems?

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  • Forward traffic between two VLANs.

    - by Michael
    I have a small network with two VLANs. One is our internal network for basic file sharing, etc and the other is a public wifi network for our customers. The internal network is configured as 192.168.1.x and the public wifi is 192.168.11.x. We have one printer at 192.168.1.50. I would like to be able to have that printer available to our customer at 192.168.11.50. I suspect it can be done with iptables, but I'm brand new to it and I just can seem to work out the syntax. Can anyone offer any help? Oh, this is all running on a wrt54g router running Tomato.

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  • How to SSH to guest ubuntu OS in vmplayer4

    - by Grace
    I have installed vmplayer4.0.4 on Windows7, and install ubuntu12.04 as Guest OS. Basically i have two problems: Default vmplayer use NAT for network access. I could ping the guest OS from the Host OS. But how could i access the Guest OS from outside the Host OS? If i change to Bridged Mode, sure the Guest Ubuntu OS could get DHCP ip in the same subnet as Host OS. But i could not ping the Guest OS from the Host OS, or vice versa, even if i disable the iptables firewall on Ubuntu Guest OS like following: iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT I could not figure it out, could anyone help on this issue? Thanks in advance.

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  • Setting lusca and dansguardian iptables on Ubuntu 12.04 to prevent loop

    - by Heri YT
    I have a server with ubuntu 12:04 operating system, which runs as a proxy cache server lusca and DansGuardian as well as internet content filter. With the following composition: the client browser - lusca - DansGuardian - internet. And all this running only on one machine only, the following is a partial configuration on my server lusca: http_port 3128 transparent cache_peer 192.168.0.1 parent 8080 0 no-query no-digest no-netdb-exchange default which is also only found on the DansGuardian default settings namely: filterip="blank" filterport=8080 proxyip=192.168.0.1 proxyport=3128 The question is: Can all goes well? By simply relying on one machine only? What causes the "WARNING: Forwarding loop detected for:"? is not problematic if we leave? How to solve "WARNING: Forwarding loop detected for:" found in / var / log / lusca / cache.log Thank you.

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  • Recommending simple appliance for DansGuardian, iptables, snort inline

    - by SRobertJames
    I'm currently using a Linksys E2000 with dd-wrt. I'd like to add DansGuardian for Content Filtering and snort-inline for IPS; but those require a more powerful box (mainly, more storage). Can you recommend a good device to use? I'm open to both overwrite-the-firmware (like dd-wrt) and designed-to-be-customized boxes. Requirements: 1. 5+ Ethernet ports, pref. GigE 2. small form factor 3. No noise (office environment) 4. low power 5. Not sure about 802.11 wireless Budget < $400, pref. less.

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  • strange behaviour of git

    - by Alexey Poimtsev
    Hi, i have strange behaviour of git - push is working, but clone is not :( alec$ git clone git://host/repo.git Initialized empty Git repository in /Users/alec/Temp/repo/.git/ host[0: x.x.x.x]: errno=Connection refused fatal: unable to connect a socket (Connection refused) whats wrong?

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