Why Don't Get Back An ACK Segment From Client
Jun 15, 2012
I am currently working on a project which purpose is to establish a TCP connection between a PC and a microcontroler.I configured (in C language) the µC as the server, and the PC as the client (in C#, using the TCPClient class).While running the codes, I capture the frames on the network with Wireshark.The client's ISN is chosen randomly by the TCPClient.Connect method.Since there will be only one TCP connection at a time, the server's ISN is always 0.The server's port is 0xC0C0 (49344) and the client's port is also chosen randomly by the TCPClient.Connect method.find the screenshot of the Wireshark's capture attached.In compliance with RFC793, the three-way-handshake should conclude with an ACK segment from the client.In my exemple, the client tries to connect three times, and then drops : the client sends no ACK segment.The µC's SYN-ACK reply may be bad configured .What kind of information did I miss ? Are there special data the client is expecting ? Why don't I get back an ACK segment from the client?
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Nov 28, 2012
I have a client with a WLC 2504 that wants to route "guest" users through a gateway appliance "radiusgateway.com" and all others through the network. It appears to me this would require the use of two fa ports on the WLC. One directly connected to the radiusgateway (which is connected to a switchport) and the other fa interface connected directly to a switchport bypassing the proxy server.
My issue is, "how do you segment the ssid traffic via the WLC". The interfaces cia the gui aren't that intelligent, there's an enable and logging drop down. Via the command line, I didn't see any methods of routing traffic.
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Nov 17, 2012
I have a couple a questions answers on which i cant google for a period. BTW maybe i simly use wrong aproach to choose keywords.
1) Is it possible to assign same ip address to the same client each time it authenticated, preferably without using DHCP? Im definely sure that it possible but cant find corresponded configuration examples (my device is Cisco 1921 with IOS 15.0.1).
2) Is it possible to assign dynamic crypto map to loopback interface (the purpose to make EASY VPN Server accessible through two interfaces - maybe you recommend other approach instead?) - as i move workingcrypto map from phy int to loopback - i cant connect with reason "Phace1 SA policy proposal not accepted"
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Nov 25, 2012
I have a Cisco 8510msr that is connected back to back with a 7206vxr across a 155Meg connection.I receive lots of Output drops on the 7206vxr interface facing the atm switch. When I do the following command:-
kwdair9#sh atm int atm 1/0Interface ATM1/0:AAL enabled: AAL5 , Maximum VCs: 4096, Current VCCs: 27 Maximum Transmit Channels: 0Max. Datagram Size: 4528PLIM Type: SONET - 155000Kbps, TX clocking: LINECell-payload scrambling: ONsts-stream scrambling: ON797522 input, 881483 output, 203946630 IN fast, 223768062 OUT fast, 0 out dropVBR-NRT : 110288 Avail bw = 44712 <====
I only have 44megConfig. is ACTIVEkwdair9# I only get 44Meg of the available 155Meg.There is no QOS on the router and the only commands I can find that vaguely see that refer to QOS are on the ATM switch:-
atm address 47.0091.8100.0000.0007.0d87.b201.0007.0d87.b201.00atm router pnnino aesa embedded-number left-justifiednode 1 level 56 lowest redistribute atm-static?why this is acting like a DS3 link and not a 155Meg link?
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Dec 4, 2011
What cable I need to connect two 2951 back to back through a HWIC-4T1/E1 card ?
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Apr 11, 2013
I have two site that has a copper wire ( 2 wire) connection between each router ( No Telco in between ). Now I want to use 1921 router with HWIC-4SHDSL-E card to connect these two site together. Can I use attach configuration to make the connection reference from the diagram ?
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Nov 25, 2011
I have 2650XM router and 2620 Router Both routers have built in WIC T1 CSU/DSU cards
2620Router --
2620Router#sh int se0/0
Serial0/0 is down, line protocol is down
Hardware is PQUICC with Fractional T1 CSU/DSU
Description: DTE side
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, loopback not set
[code]....
My question is that cisco website says there are two type of cable connections for this type of config --which are --T1 CSU/DSU ConfigurationSet one CSU/DSU to clock source internal, and the other CSU/DSU to clock source line. The linecode, framing, data-coding, and timeslots must be set the same on both CSU/DSUs.Four-Wire 56k CSU/DSU Configuration For my network connection which type of config i should use??Secondly i try to connect these ports by normal crossover cable it did not work.So for this type of connection i know i need T1 cross over cable-- which has RJ 48 connections at both sides.I check cable from ebay which is RJ45 RJ48 cross over -- will this cable work in my router to router connection.
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Oct 19, 2012
I have 1 2611xm router and 1 2801 router. For my own lab purpose, i want to configure them back to back to support voice services. I don't know what configuration will be required at each end. in 2611xm, i have NM-2V and its also detecting the card, so i hope it will work ? also what commands i need to run on both ends .
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Jan 8, 2013
I would like configure two router (e.g. 1921) back to back via a 2 pin copper wire. Can I use HWIC-4SHDSL-E card to do it? What is the configuration I can use?
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Apr 14, 2013
I have two site that has a copper wire (2 wire) connection between each router ( No Telco in between )Now I want to use 1921 router with HWIC-4SH DSL-E card to connect these two ste together.Can I use attach configuration to make the connection reference from the diagram?
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Feb 29, 2012
Just to get this clear as having issues with a E1 link with CRC's at one.Router A,Network-Clock-Participate WIC 1,Should router B have clock participate for WIC 1? We currently have controllers set as UNFRAMED but guess we can set to NO-CRC4 both ends and telco will pass this.
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Jan 7, 2013
I'm looking for instructions on how to setup and connect two RV082 routers together with a crossover cable between their WAN ports. This is to connect two separate LANS together via an ethernet connection. For staging we are setting everything up with a crossover cable in our shop. Ultimately the crossover cable will be replaced by a microwave link between the two LANS several miles apart. There will be no internet connection.
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Aug 28, 2012
securing a back-toback connection using E1.The connection is between two cities, using 2x CISCO 1841 router + VWIC-1MFT-E1 interface at each city.
The E1 connections has been provided by our local telco, and they are completely private. The customer is a bank, and they asking me if this is a secure connection or not. If possible, we need to guarantee that no body can get access to the bank network even if they brought E1 modem at one of the ends (telco PoP).
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Apr 7, 2013
I searched a lot but couldnt find a clear document about connecting 2 G.SHDSL routers back to back.First of all I am not sure which type of cable (RJ11) is used for connecting two 878 routers. Does it have to be cross or straight cable.
Which RJ11 pairs will be connected each other [code]
According the configuration samples One router must be CPE and the other must be CO for simulating DSLAM.
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Apr 14, 2011
2 dhcp server on the same lan segment not thesame ip add series , how can i prevent to lease ip from another ip series
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Aug 4, 2012
I have a standard switch with a server two routers one for data one for VoIP Server is dhcp and dns, all clients are auto configured from the server - all is good.I want to share my internet with anouther business - in the same building I have added a Ethernet router with a different ip range and this router is their dhcp server with its own private LAN This router has been connected to our LAN via the the Ethernet router wan port Works fine, but all clients on the new private lan can ping and see the LAN behind the wan port of the Ethernet router and can ping them, in some cases certain files can be seen?
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Dec 15, 2011
I'm having some trouble getting two Cisco 888's to work correctly back to back.. The two routers will ultimately be used in conjunction with a BT EPS8 circuit which is effectively four wires short distance between customer sites. We have configured lots of these using the older Cisco 878's.
Anyway, as i've been struggling to get line sync on site I've gone back to basics and connected the two 888's back to back. However, I've found that no matter what I do I can only get the routers to sync at 384kbps!? And that's with a one meter RJ11-RJ11 cable.. Very strange. When we've used the 878's we get much more bandwidth. I have tried statically assigning the line rate at both ends but it still only works at 384kbps.
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Jul 2, 2011
We are in middle of deploying WiSM2s on our network, from a design point of view i am confused on where to position the WiSM2s. We have 2 DCs and from best practice architecture view WLC should not be placed on the Data Center segment, but it seems that is the only option i have.
DCs host 6509s, i am planning to host 1 WiSM in each DC, all clients will be on seperate subnet. Do you foresee any issues with this deployment or any security issues? authentications are followed as per cisco recommendation, clients authenticated against AD through ACS so it is fairly secure.
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Jul 13, 2012
The default Gateway and DHCP server is connected to port 1 of the switch. I have various other devices on the network plugged into other ports on the switch.I want port 1 to communicate with every port on the switch, but don't want the other ports to be able to see eachother unless I specifically allow them to. For example, port 5 should see port 1, and 7, but nothing else.Everything needs to be in the same subnet. With the older Dlink switches I am used to this feature is called "Port Segmentation" but I see no such option in this switch. I have been playing with the VLAN settings but so far I have not been able to achieve this.
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May 31, 2013
I have been having a heck of a time trying to configure my 5505 to allow the second segment on my network to use the internet. Office 1 has a fiber internet connection, and all traffic flows fine. Office 2 had gotten it's internet from AT&T, via a network based firewall injecting a default route into the mpls cloud. both offices connunicate to each other through the mpls.
When we added the fiber to office 1, we had the mpls people change the default internet route to the inside address of the 5505 and things worked fine. when AT&T attempted to remove the NBF defaut route, and inject the 5505's address as default, things didn't go so well.
AT&T claims that it is within my nat cmmands on the 5505, but won't tell me anything else. I assume that they are correct, and I assume that I am not good enough with the 5505 ASDM to tell it what to do.
Office 1 uses 10.10.30.xx addresses and Office 2 uses 10.10.10.xx - the 5505 inside interface is 10.10.30.2 the internal interfaces of the mpls are 10.10.30.1 and 10.10.10.1
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May 26, 2013
I am setting up my lab using two 2901 routers which is running on 15.2 IOS.I am trying to simulate a back to back BRI.BRI Module: WIC-1B-S/T-V3 (x2) one of each router.
I followed this amazing document to understand the concept of BRI and configuration. url..but it never says if i can use the module that i have mentioned.
Q1. What cabling i need to use to setup back to back BRI using 2x 2901 routers with these modules?
Q2. What cabling do i need to use.
Q3. Is it actually possible to use these 2 modules alone to simulate a back to back BRI..?
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Mar 23, 2013
WAN link plugs into a 2821 Router with an switch module in it. About 8 clients are plugged in to the 2821.2821 connects to super cheap netgear switch (I'm 99% sure it's stripping dot1q headers) via one of the ports in the switch module. About 4 people are connected to the netgear.Now, I sent a catalyst 3560g to the branch because they wanted to extend into a new building. Someone decided to run a single cable from the netgear to the 3560. On the 3560, I have about 5 clients and a couple of APs.
So it goes 2821 -> Netgear -> 3560. All of these are single connections.When the 3560 gets plugged in, all clients on the netgear lose their connection, and nothing on the 3560 works. It happens almost instantly. I can't figure out why connections are dropping. The APs have about 4 VLANs onn them, and the PCs are on their own VLAN (the native VLAN).
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Aug 21, 2012
We have an OSPF network with four 6500 Distribution Switches. They are fully meshed and see each other as peers and are sharing routes. Off of one pair (Border) there is a setup of 3750G siwtches that go off to another network and they do not run OSPF. Between the Border Dist and the 3750G Switches we run HSRP. The 3750G side uses HSRP GP 192 and the Dist Side uses HSRP 192.There are static routes on the 3750G pointing to the Dist HSRP address to get back to network.Pings fail from the OSPF side to the HSRP address on the 3750G side.If I do a trace from the OSPF side to the HSRP address it hits one border dist switch then the other and fails.If I have static routes on both border dist switches pointing to the HSRP on the 3750side, do we need to change the metric on one dist so that it is preferred over the other or should the router Id take care of that?
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May 23, 2013
I was asked to enable netflow in an ASA Firewall for Orion/Solarwinds server monitoration. Firewall is a 5550, with 4G RAM, and no extra modules but SSM-4GE. This firewall has 5 DMZ segments and ans specific segment for internet traffic.There are segments as unique subinterfaces in physical interfaces. Other segments as individual subinterfaces in the same physical interface (but individual VLANs)Usually firewall CPU flows between 30% to 40%. Rarely to 50%.
1 - How dangerous or risky could be implement netflow in this firewall?...This firewall is very critical for the customer. My concern is regrading CPU, traffic generated, memory, etc
2 - In a month, firewall will be migrated from 8.2 software version to 8.4 software version. Is there any incompatibility in some commands?...Would be recommended to perform netflow configuration after software upgrade?
3 - How could it be implemented for Orion monitoring, regarding each individual sub-interface (and so, each VLAN assigned)?I there any recommendation regarding configuration, best practices?
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Feb 5, 2012
I need to create a firewalled segment that not only separates hosts from general population, but also from each other. The solitary confinement of firewalled segments.I know that I could create a bunch of sub-interfaces, one for each host or group that needs to be isolated, but I'd really rather not have to do that if possible. 1) It could become a management nightmare between ACLs and sub-interfaces and 2) it's a waste of IP addresses.s there any way that I can create a bunch of separate VLANs behind the firewall and have them all terminate at the firewall, using a single firewall IP address for the gateway?
VLAN 1 - hosts 1.1.1.5 and 1.1.1.6VLAN 2 - hosts 1.1.1.7
Firewall DMZ Interface - 1.1.1.1VLAN 3 - hosts 1.1.1.8 and 1.1.1.9
This way, the hosts are isolated and can't talk to each other unless they're on the same VLAN.I'm working with an ASA 5510 running 8.2.4(4).
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Apr 21, 2013
Do the problem caused by the modems itself or it just sign of faulty Ethernet switch (using 20 port Allied Telesis ethernet switch).
Sometimes I cannot connect to internet due to "unidentified network" buy i can resolve this problem by restarting my modem + switch.
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Mar 20, 2012
i have a question about tunneling a software EasyVPN client to a client ASA Network. It looks like this:
EasyVPN Server 192.168.202.0/24 Network extension mode to Client EasyVPN ASA 192.168.1.0/24 This works fine in both directions. But now i want to connect the client ASA network via EasyVPN software client from outside. The user are already able to connect to the ASA Server on its static outside IP obtaining an IP from a 192.168.21.0/24 pool. This works fine. But how am i able to connect to the 192.168.1.0/24 network from this client?
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Apr 18, 2013
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May 11, 2011
I have a desk top not wireless i have a laptop wirelesss i have a linksy wireless router i jumped or seomething happen to my desk top i have no promlems getting on line. My desk top used to be on network abc and now it says it is hooked up to network 2 and all these messages keep coming up with my firewall i tried to get back on abc network and can't i have to play around to get on network 2 to get on line.
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Mar 15, 2012
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