check your MTU settings with

user@computer:~$ tracepath -n www.cix.hr
1: 10.254.30.250 0.099ms pmtu 1500
1: 10.254.30.254 0.425ms
1: 10.254.30.254 0.405ms
2: 10.0.0.1 1.345ms
3: 212.92.211.193 4.111ms
4: 10.51.0.2 4.327ms
5: 10.50.0.74 192.967ms
6: 193.192.15.65 6.561ms asymm 7
7: 193.198.228.98 4.719ms asymm 10
8: 193.198.228.110 6.181ms asymm 9
9: 193.198.229.69 5.390ms asymm 10
10: 161.53.2.116 4.403ms reached
Resume: pmtu 1500 hops 10 back 54

my customer is peering with 2 ISP’s and has configuration with 2 BGP routers mutually connected with iBGP.
routers are reciving full tables from ISP’s and has 4 byte AS (XXXXXX).

recently we noticed that BGP session between customer and ISP2 is constantly flapping each 3 minutes. logs didn’t show anything useful

%BGP-4-MSGDUMP: unsupported or mal-formatted message received from X.X.X.X

I searched cisco forums and tried to isolate problem by inserting hidden command “neighbor X.X.X.X dont-capability-negotiate”.

%BGP-3-NOTIFICATION: received from neighbor X.X.X.X active 2/2 (peer in wrong AS) 2 bytes 5BA0

by reading this article I assumed that ISP is announcing itself with wrong AS.

problem was finally solved by entering command in global configuration mode (and removing dont-capability-negotiate)

ip tcp mss 1440

To learn something more about TCP MSS go here.

How to open telnet/ssh sessions from firefox with putty? Simply add following script as application under Edit – Preferences – Applications.

#!/usr/bin/perl
# parse URL
 ($protocol,$host) = split /:\/\//, $ARGV[0];
 ($host,$port) = split /:/, $host;
# validate input
 if ( $protocol !~ /^(telnet|ssh)$/ ||
 $host !~ /^[a-zA-Z0-9][a-zA-Z0-9.-]*$/ ||
 $port !~ /(^[a-zA-Z0-9][a-zA-Z0-9_-]*$|^$)/ ) {
 warn "Invalid URL";
 exit 1;
 }
# if SSH, add -p argument
 if ( $protocol eq "ssh" && $port != '' ) { $port = "-p $port" ; }
# call terminal emulator
 exec("putty -$protocol $host $port");
 exit;

Script taken and modified from tolaris.